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/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const stringToByteArray$1 = function (str) {
    // TODO(user): Use native implementations if/when available
    const out = [];
    let p = 0;
    for (let i = 0; i < str.length; i++) {
        let c = str.charCodeAt(i);
        if (c < 128) {
            out[p++] = c;
        }
        else if (c < 2048) {
            out[p++] = (c >> 6) | 192;
            out[p++] = (c & 63) | 128;
        }
        else if ((c & 0xfc00) === 0xd800 &&
            i + 1 < str.length &&
            (str.charCodeAt(i + 1) & 0xfc00) === 0xdc00) {
            // Surrogate Pair
            c = 0x10000 + ((c & 0x03ff) << 10) + (str.charCodeAt(++i) & 0x03ff);
            out[p++] = (c >> 18) | 240;
            out[p++] = ((c >> 12) & 63) | 128;
            out[p++] = ((c >> 6) & 63) | 128;
            out[p++] = (c & 63) | 128;
        }
        else {
            out[p++] = (c >> 12) | 224;
            out[p++] = ((c >> 6) & 63) | 128;
            out[p++] = (c & 63) | 128;
        }
    }
    return out;
};
/**
 * Turns an array of numbers into the string given by the concatenation of the
 * characters to which the numbers correspond.
 * @param bytes Array of numbers representing characters.
 * @return Stringification of the array.
 */
const byteArrayToString = function (bytes) {
    // TODO(user): Use native implementations if/when available
    const out = [];
    let pos = 0, c = 0;
    while (pos < bytes.length) {
        const c1 = bytes[pos++];
        if (c1 < 128) {
            out[c++] = String.fromCharCode(c1);
        }
        else if (c1 > 191 && c1 < 224) {
            const c2 = bytes[pos++];
            out[c++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
        }
        else if (c1 > 239 && c1 < 365) {
            // Surrogate Pair
            const c2 = bytes[pos++];
            const c3 = bytes[pos++];
            const c4 = bytes[pos++];
            const u = (((c1 & 7) << 18) | ((c2 & 63) << 12) | ((c3 & 63) << 6) | (c4 & 63)) -
                0x10000;
            out[c++] = String.fromCharCode(0xd800 + (u >> 10));
            out[c++] = String.fromCharCode(0xdc00 + (u & 1023));
        }
        else {
            const c2 = bytes[pos++];
            const c3 = bytes[pos++];
            out[c++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
        }
    }
    return out.join('');
};
// We define it as an object literal instead of a class because a class compiled down to es5 can't
// be treeshaked. https://github.com/rollup/rollup/issues/1691
// Static lookup maps, lazily populated by init_()
const base64 = {
    /**
     * Maps bytes to characters.
     */
    byteToCharMap_: null,
    /**
     * Maps characters to bytes.
     */
    charToByteMap_: null,
    /**
     * Maps bytes to websafe characters.
     * @private
     */
    byteToCharMapWebSafe_: null,
    /**
     * Maps websafe characters to bytes.
     * @private
     */
    charToByteMapWebSafe_: null,
    /**
     * Our default alphabet, shared between
     * ENCODED_VALS and ENCODED_VALS_WEBSAFE
     */
    ENCODED_VALS_BASE: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' + 'abcdefghijklmnopqrstuvwxyz' + '0123456789',
    /**
     * Our default alphabet. Value 64 (=) is special; it means "nothing."
     */
    get ENCODED_VALS() {
        return this.ENCODED_VALS_BASE + '+/=';
    },
    /**
     * Our websafe alphabet.
     */
    get ENCODED_VALS_WEBSAFE() {
        return this.ENCODED_VALS_BASE + '-_.';
    },
    /**
     * Whether this browser supports the atob and btoa functions. This extension
     * started at Mozilla but is now implemented by many browsers. We use the
     * ASSUME_* variables to avoid pulling in the full useragent detection library
     * but still allowing the standard per-browser compilations.
     *
     */
    HAS_NATIVE_SUPPORT: typeof atob === 'function',
    /**
     * Base64-encode an array of bytes.
     *
     * @param input An array of bytes (numbers with
     *     value in [0, 255]) to encode.
     * @param webSafe Boolean indicating we should use the
     *     alternative alphabet.
     * @return The base64 encoded string.
     */
    encodeByteArray(input, webSafe) {
        if (!Array.isArray(input)) {
            throw Error('encodeByteArray takes an array as a parameter');
        }
        this.init_();
        const byteToCharMap = webSafe
            ? this.byteToCharMapWebSafe_
            : this.byteToCharMap_;
        const output = [];
        for (let i = 0; i < input.length; i += 3) {
            const byte1 = input[i];
            const haveByte2 = i + 1 < input.length;
            const byte2 = haveByte2 ? input[i + 1] : 0;
            const haveByte3 = i + 2 < input.length;
            const byte3 = haveByte3 ? input[i + 2] : 0;
            const outByte1 = byte1 >> 2;
            const outByte2 = ((byte1 & 0x03) << 4) | (byte2 >> 4);
            let outByte3 = ((byte2 & 0x0f) << 2) | (byte3 >> 6);
            let outByte4 = byte3 & 0x3f;
            if (!haveByte3) {
                outByte4 = 64;
                if (!haveByte2) {
                    outByte3 = 64;
                }
            }
            output.push(byteToCharMap[outByte1], byteToCharMap[outByte2], byteToCharMap[outByte3], byteToCharMap[outByte4]);
        }
        return output.join('');
    },
    /**
     * Base64-encode a string.
     *
     * @param input A string to encode.
     * @param webSafe If true, we should use the
     *     alternative alphabet.
     * @return The base64 encoded string.
     */
    encodeString(input, webSafe) {
        // Shortcut for Mozilla browsers that implement
        // a native base64 encoder in the form of "btoa/atob"
        if (this.HAS_NATIVE_SUPPORT && !webSafe) {
            return btoa(input);
        }
        return this.encodeByteArray(stringToByteArray$1(input), webSafe);
    },
    /**
     * Base64-decode a string.
     *
     * @param input to decode.
     * @param webSafe True if we should use the
     *     alternative alphabet.
     * @return string representing the decoded value.
     */
    decodeString(input, webSafe) {
        // Shortcut for Mozilla browsers that implement
        // a native base64 encoder in the form of "btoa/atob"
        if (this.HAS_NATIVE_SUPPORT && !webSafe) {
            return atob(input);
        }
        return byteArrayToString(this.decodeStringToByteArray(input, webSafe));
    },
    /**
     * Base64-decode a string.
     *
     * In base-64 decoding, groups of four characters are converted into three
     * bytes.  If the encoder did not apply padding, the input length may not
     * be a multiple of 4.
     *
     * In this case, the last group will have fewer than 4 characters, and
     * padding will be inferred.  If the group has one or two characters, it decodes
     * to one byte.  If the group has three characters, it decodes to two bytes.
     *
     * @param input Input to decode.
     * @param webSafe True if we should use the web-safe alphabet.
     * @return bytes representing the decoded value.
     */
    decodeStringToByteArray(input, webSafe) {
        this.init_();
        const charToByteMap = webSafe
            ? this.charToByteMapWebSafe_
            : this.charToByteMap_;
        const output = [];
        for (let i = 0; i < input.length;) {
            const byte1 = charToByteMap[input.charAt(i++)];
            const haveByte2 = i < input.length;
            const byte2 = haveByte2 ? charToByteMap[input.charAt(i)] : 0;
            ++i;
            const haveByte3 = i < input.length;
            const byte3 = haveByte3 ? charToByteMap[input.charAt(i)] : 64;
            ++i;
            const haveByte4 = i < input.length;
            const byte4 = haveByte4 ? charToByteMap[input.charAt(i)] : 64;
            ++i;
            if (byte1 == null || byte2 == null || byte3 == null || byte4 == null) {
                throw new DecodeBase64StringError();
            }
            const outByte1 = (byte1 << 2) | (byte2 >> 4);
            output.push(outByte1);
            if (byte3 !== 64) {
                const outByte2 = ((byte2 << 4) & 0xf0) | (byte3 >> 2);
                output.push(outByte2);
                if (byte4 !== 64) {
                    const outByte3 = ((byte3 << 6) & 0xc0) | byte4;
                    output.push(outByte3);
                }
            }
        }
        return output;
    },
    /**
     * Lazy static initialization function. Called before
     * accessing any of the static map variables.
     * @private
     */
    init_() {
        if (!this.byteToCharMap_) {
            this.byteToCharMap_ = {};
            this.charToByteMap_ = {};
            this.byteToCharMapWebSafe_ = {};
            this.charToByteMapWebSafe_ = {};
            // We want quick mappings back and forth, so we precompute two maps.
            for (let i = 0; i < this.ENCODED_VALS.length; i++) {
                this.byteToCharMap_[i] = this.ENCODED_VALS.charAt(i);
                this.charToByteMap_[this.byteToCharMap_[i]] = i;
                this.byteToCharMapWebSafe_[i] = this.ENCODED_VALS_WEBSAFE.charAt(i);
                this.charToByteMapWebSafe_[this.byteToCharMapWebSafe_[i]] = i;
                // Be forgiving when decoding and correctly decode both encodings.
                if (i >= this.ENCODED_VALS_BASE.length) {
                    this.charToByteMap_[this.ENCODED_VALS_WEBSAFE.charAt(i)] = i;
                    this.charToByteMapWebSafe_[this.ENCODED_VALS.charAt(i)] = i;
                }
            }
        }
    }
};
/**
 * An error encountered while decoding base64 string.
 */
class DecodeBase64StringError extends Error {
    constructor() {
        super(...arguments);
        this.name = 'DecodeBase64StringError';
    }
}
/**
 * URL-safe base64 encoding
 */
const base64Encode = function (str) {
    const utf8Bytes = stringToByteArray$1(str);
    return base64.encodeByteArray(utf8Bytes, true);
};
/**
 * URL-safe base64 encoding (without "." padding in the end).
 * e.g. Used in JSON Web Token (JWT) parts.
 */
const base64urlEncodeWithoutPadding = function (str) {
    // Use base64url encoding and remove padding in the end (dot characters).
    return base64Encode(str).replace(/\./g, '');
};
/**
 * URL-safe base64 decoding
 *
 * NOTE: DO NOT use the global atob() function - it does NOT support the
 * base64Url variant encoding.
 *
 * @param str To be decoded
 * @return Decoded result, if possible
 */
const base64Decode = function (str) {
    try {
        return base64.decodeString(str, true);
    }
    catch (e) {
        console.error('base64Decode failed: ', e);
    }
    return null;
};

/**
 * @license
 * Copyright 2022 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const getDefaultsFromGlobal = () => getGlobal().__FIREBASE_DEFAULTS__;
/**
 * Attempt to read defaults from a JSON string provided to
 * process(.)env(.)__FIREBASE_DEFAULTS__ or a JSON file whose path is in
 * process(.)env(.)__FIREBASE_DEFAULTS_PATH__
 * The dots are in parens because certain compilers (Vite?) cannot
 * handle seeing that variable in comments.
 * See https://github.com/firebase/firebase-js-sdk/issues/6838
 */
const getDefaultsFromEnvVariable = () => {
    if (typeof process === 'undefined' || typeof process.env === 'undefined') {
        return;
    }
    const defaultsJsonString = process.env.__FIREBASE_DEFAULTS__;
    if (defaultsJsonString) {
        return JSON.parse(defaultsJsonString);
    }
};
const getDefaultsFromCookie = () => {
    if (typeof document === 'undefined') {
        return;
    }
    let match;
    try {
        match = document.cookie.match(/__FIREBASE_DEFAULTS__=([^;]+)/);
    }
    catch (e) {
        // Some environments such as Angular Universal SSR have a
        // `document` object but error on accessing `document.cookie`.
        return;
    }
    const decoded = match && base64Decode(match[1]);
    return decoded && JSON.parse(decoded);
};
/**
 * Get the __FIREBASE_DEFAULTS__ object. It checks in order:
 * (1) if such an object exists as a property of `globalThis`
 * (2) if such an object was provided on a shell environment variable
 * (3) if such an object exists in a cookie
 * @public
 */
const getDefaults = () => {
    try {
        return (getDefaultsFromGlobal() ||
            getDefaultsFromEnvVariable() ||
            getDefaultsFromCookie());
    }
    catch (e) {
        /**
         * Catch-all for being unable to get __FIREBASE_DEFAULTS__ due
         * to any environment case we have not accounted for. Log to
         * info instead of swallowing so we can find these unknown cases
         * and add paths for them if needed.
         */
        console.info(`Unable to get __FIREBASE_DEFAULTS__ due to: ${e}`);
        return;
    }
};
/**
 * Returns emulator host stored in the __FIREBASE_DEFAULTS__ object
 * for the given product.
 * @returns a URL host formatted like `127.0.0.1:9999` or `[::1]:4000` if available
 * @public
 */
const getDefaultEmulatorHost = (productName) => { var _a, _b; return (_b = (_a = getDefaults()) === null || _a === void 0 ? void 0 : _a.emulatorHosts) === null || _b === void 0 ? void 0 : _b[productName]; };
/**
 * Returns emulator hostname and port stored in the __FIREBASE_DEFAULTS__ object
 * for the given product.
 * @returns a pair of hostname and port like `["::1", 4000]` if available
 * @public
 */
const getDefaultEmulatorHostnameAndPort = (productName) => {
    const host = getDefaultEmulatorHost(productName);
    if (!host) {
        return undefined;
    }
    const separatorIndex = host.lastIndexOf(':'); // Finding the last since IPv6 addr also has colons.
    if (separatorIndex <= 0 || separatorIndex + 1 === host.length) {
        throw new Error(`Invalid host ${host} with no separate hostname and port!`);
    }
    // eslint-disable-next-line no-restricted-globals
    const port = parseInt(host.substring(separatorIndex + 1), 10);
    if (host[0] === '[') {
        // Bracket-quoted `[ipv6addr]:port` => return "ipv6addr" (without brackets).
        return [host.substring(1, separatorIndex - 1), port];
    }
    else {
        return [host.substring(0, separatorIndex), port];
    }
};
/**
 * Returns Firebase app config stored in the __FIREBASE_DEFAULTS__ object.
 * @public
 */
const getDefaultAppConfig = () => { var _a; return (_a = getDefaults()) === null || _a === void 0 ? void 0 : _a.config; };
/**
 * Returns an experimental setting on the __FIREBASE_DEFAULTS__ object (properties
 * prefixed by "_")
 * @public
 */
const getExperimentalSetting = (name) => { var _a; return (_a = getDefaults()) === null || _a === void 0 ? void 0 : _a[`_${name}`]; };

/**
 * @license
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
function createMockUserToken(token, projectId) {
    if (token.uid) {
        throw new Error('The "uid" field is no longer supported by mockUserToken. Please use "sub" instead for Firebase Auth User ID.');
    }
    // Unsecured JWTs use "none" as the algorithm.
    const header = {
        alg: 'none',
        type: 'JWT'
    };
    const project = projectId || 'demo-project';
    const iat = token.iat || 0;
    const sub = token.sub || token.user_id;
    if (!sub) {
        throw new Error("mockUserToken must contain 'sub' or 'user_id' field!");
    }
    const payload = Object.assign({ 
        // Set all required fields to decent defaults
        iss: `https://securetoken.google.com/${project}`, aud: project, iat, exp: iat + 3600, auth_time: iat, sub, user_id: sub, firebase: {
            sign_in_provider: 'custom',
            identities: {}
        } }, token);
    // Unsecured JWTs use the empty string as a signature.
    const signature = '';
    return [
        base64urlEncodeWithoutPadding(JSON.stringify(header)),
        base64urlEncodeWithoutPadding(JSON.stringify(payload)),
        signature
    ].join('.');
}

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @fileoverview SHA-1 cryptographic hash.
 * Variable names follow the notation in FIPS PUB 180-3:
 * http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf.
 *
 * Usage:
 *   var sha1 = new sha1();
 *   sha1.update(bytes);
 *   var hash = sha1.digest();
 *
 * Performance:
 *   Chrome 23:   ~400 Mbit/s
 *   Firefox 16:  ~250 Mbit/s
 *
 */
/**
 * SHA-1 cryptographic hash constructor.
 *
 * The properties declared here are discussed in the above algorithm document.
 * @constructor
 * @final
 * @struct
 */
class Sha1 {
    constructor() {
        /**
         * Holds the previous values of accumulated variables a-e in the compress_
         * function.
         * @private
         */
        this.chain_ = [];
        /**
         * A buffer holding the partially computed hash result.
         * @private
         */
        this.buf_ = [];
        /**
         * An array of 80 bytes, each a part of the message to be hashed.  Referred to
         * as the message schedule in the docs.
         * @private
         */
        this.W_ = [];
        /**
         * Contains data needed to pad messages less than 64 bytes.
         * @private
         */
        this.pad_ = [];
        /**
         * @private {number}
         */
        this.inbuf_ = 0;
        /**
         * @private {number}
         */
        this.total_ = 0;
        this.blockSize = 512 / 8;
        this.pad_[0] = 128;
        for (let i = 1; i < this.blockSize; ++i) {
            this.pad_[i] = 0;
        }
        this.reset();
    }
    reset() {
        this.chain_[0] = 0x67452301;
        this.chain_[1] = 0xefcdab89;
        this.chain_[2] = 0x98badcfe;
        this.chain_[3] = 0x10325476;
        this.chain_[4] = 0xc3d2e1f0;
        this.inbuf_ = 0;
        this.total_ = 0;
    }
    /**
     * Internal compress helper function.
     * @param buf Block to compress.
     * @param offset Offset of the block in the buffer.
     * @private
     */
    compress_(buf, offset) {
        if (!offset) {
            offset = 0;
        }
        const W = this.W_;
        // get 16 big endian words
        if (typeof buf === 'string') {
            for (let i = 0; i < 16; i++) {
                // TODO(user): [bug 8140122] Recent versions of Safari for Mac OS and iOS
                // have a bug that turns the post-increment ++ operator into pre-increment
                // during JIT compilation.  We have code that depends heavily on SHA-1 for
                // correctness and which is affected by this bug, so I've removed all uses
                // of post-increment ++ in which the result value is used.  We can revert
                // this change once the Safari bug
                // (https://bugs.webkit.org/show_bug.cgi?id=109036) has been fixed and
                // most clients have been updated.
                W[i] =
                    (buf.charCodeAt(offset) << 24) |
                        (buf.charCodeAt(offset + 1) << 16) |
                        (buf.charCodeAt(offset + 2) << 8) |
                        buf.charCodeAt(offset + 3);
                offset += 4;
            }
        }
        else {
            for (let i = 0; i < 16; i++) {
                W[i] =
                    (buf[offset] << 24) |
                        (buf[offset + 1] << 16) |
                        (buf[offset + 2] << 8) |
                        buf[offset + 3];
                offset += 4;
            }
        }
        // expand to 80 words
        for (let i = 16; i < 80; i++) {
            const t = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16];
            W[i] = ((t << 1) | (t >>> 31)) & 0xffffffff;
        }
        let a = this.chain_[0];
        let b = this.chain_[1];
        let c = this.chain_[2];
        let d = this.chain_[3];
        let e = this.chain_[4];
        let f, k;
        // TODO(user): Try to unroll this loop to speed up the computation.
        for (let i = 0; i < 80; i++) {
            if (i < 40) {
                if (i < 20) {
                    f = d ^ (b & (c ^ d));
                    k = 0x5a827999;
                }
                else {
                    f = b ^ c ^ d;
                    k = 0x6ed9eba1;
                }
            }
            else {
                if (i < 60) {
                    f = (b & c) | (d & (b | c));
                    k = 0x8f1bbcdc;
                }
                else {
                    f = b ^ c ^ d;
                    k = 0xca62c1d6;
                }
            }
            const t = (((a << 5) | (a >>> 27)) + f + e + k + W[i]) & 0xffffffff;
            e = d;
            d = c;
            c = ((b << 30) | (b >>> 2)) & 0xffffffff;
            b = a;
            a = t;
        }
        this.chain_[0] = (this.chain_[0] + a) & 0xffffffff;
        this.chain_[1] = (this.chain_[1] + b) & 0xffffffff;
        this.chain_[2] = (this.chain_[2] + c) & 0xffffffff;
        this.chain_[3] = (this.chain_[3] + d) & 0xffffffff;
        this.chain_[4] = (this.chain_[4] + e) & 0xffffffff;
    }
    update(bytes, length) {
        // TODO(johnlenz): tighten the function signature and remove this check
        if (bytes == null) {
            return;
        }
        if (length === undefined) {
            length = bytes.length;
        }
        const lengthMinusBlock = length - this.blockSize;
        let n = 0;
        // Using local instead of member variables gives ~5% speedup on Firefox 16.
        const buf = this.buf_;
        let inbuf = this.inbuf_;
        // The outer while loop should execute at most twice.
        while (n < length) {
            // When we have no data in the block to top up, we can directly process the
            // input buffer (assuming it contains sufficient data). This gives ~25%
            // speedup on Chrome 23 and ~15% speedup on Firefox 16, but requires that
            // the data is provided in large chunks (or in multiples of 64 bytes).
            if (inbuf === 0) {
                while (n <= lengthMinusBlock) {
                    this.compress_(bytes, n);
                    n += this.blockSize;
                }
            }
            if (typeof bytes === 'string') {
                while (n < length) {
                    buf[inbuf] = bytes.charCodeAt(n);
                    ++inbuf;
                    ++n;
                    if (inbuf === this.blockSize) {
                        this.compress_(buf);
                        inbuf = 0;
                        // Jump to the outer loop so we use the full-block optimization.
                        break;
                    }
                }
            }
            else {
                while (n < length) {
                    buf[inbuf] = bytes[n];
                    ++inbuf;
                    ++n;
                    if (inbuf === this.blockSize) {
                        this.compress_(buf);
                        inbuf = 0;
                        // Jump to the outer loop so we use the full-block optimization.
                        break;
                    }
                }
            }
        }
        this.inbuf_ = inbuf;
        this.total_ += length;
    }
    /** @override */
    digest() {
        const digest = [];
        let totalBits = this.total_ * 8;
        // Add pad 0x80 0x00*.
        if (this.inbuf_ < 56) {
            this.update(this.pad_, 56 - this.inbuf_);
        }
        else {
            this.update(this.pad_, this.blockSize - (this.inbuf_ - 56));
        }
        // Add # bits.
        for (let i = this.blockSize - 1; i >= 56; i--) {
            this.buf_[i] = totalBits & 255;
            totalBits /= 256; // Don't use bit-shifting here!
        }
        this.compress_(this.buf_);
        let n = 0;
        for (let i = 0; i < 5; i++) {
            for (let j = 24; j >= 0; j -= 8) {
                digest[n] = (this.chain_[i] >> j) & 255;
                ++n;
            }
        }
        return digest;
    }
}

/**
 * Helper to make a Subscribe function (just like Promise helps make a
 * Thenable).
 *
 * @param executor Function which can make calls to a single Observer
 *     as a proxy.
 * @param onNoObservers Callback when count of Observers goes to zero.
 */
function createSubscribe(executor, onNoObservers) {
    const proxy = new ObserverProxy(executor, onNoObservers);
    return proxy.subscribe.bind(proxy);
}
/**
 * Implement fan-out for any number of Observers attached via a subscribe
 * function.
 */
class ObserverProxy {
    /**
     * @param executor Function which can make calls to a single Observer
     *     as a proxy.
     * @param onNoObservers Callback when count of Observers goes to zero.
     */
    constructor(executor, onNoObservers) {
        this.observers = [];
        this.unsubscribes = [];
        this.observerCount = 0;
        // Micro-task scheduling by calling task.then().
        this.task = Promise.resolve();
        this.finalized = false;
        this.onNoObservers = onNoObservers;
        // Call the executor asynchronously so subscribers that are called
        // synchronously after the creation of the subscribe function
        // can still receive the very first value generated in the executor.
        this.task
            .then(() => {
            executor(this);
        })
            .catch(e => {
            this.error(e);
        });
    }
    next(value) {
        this.forEachObserver((observer) => {
            observer.next(value);
        });
    }
    error(error) {
        this.forEachObserver((observer) => {
            observer.error(error);
        });
        this.close(error);
    }
    complete() {
        this.forEachObserver((observer) => {
            observer.complete();
        });
        this.close();
    }
    /**
     * Subscribe function that can be used to add an Observer to the fan-out list.
     *
     * - We require that no event is sent to a subscriber sychronously to their
     *   call to subscribe().
     */
    subscribe(nextOrObserver, error, complete) {
        let observer;
        if (nextOrObserver === undefined &&
            error === undefined &&
            complete === undefined) {
            throw new Error('Missing Observer.');
        }
        // Assemble an Observer object when passed as callback functions.
        if (implementsAnyMethods(nextOrObserver, [
            'next',
            'error',
            'complete'
        ])) {
            observer = nextOrObserver;
        }
        else {
            observer = {
                next: nextOrObserver,
                error,
                complete
            };
        }
        if (observer.next === undefined) {
            observer.next = noop;
        }
        if (observer.error === undefined) {
            observer.error = noop;
        }
        if (observer.complete === undefined) {
            observer.complete = noop;
        }
        const unsub = this.unsubscribeOne.bind(this, this.observers.length);
        // Attempt to subscribe to a terminated Observable - we
        // just respond to the Observer with the final error or complete
        // event.
        if (this.finalized) {
            // eslint-disable-next-line @typescript-eslint/no-floating-promises
            this.task.then(() => {
                try {
                    if (this.finalError) {
                        observer.error(this.finalError);
                    }
                    else {
                        observer.complete();
                    }
                }
                catch (e) {
                    // nothing
                }
                return;
            });
        }
        this.observers.push(observer);
        return unsub;
    }
    // Unsubscribe is synchronous - we guarantee that no events are sent to
    // any unsubscribed Observer.
    unsubscribeOne(i) {
        if (this.observers === undefined || this.observers[i] === undefined) {
            return;
        }
        delete this.observers[i];
        this.observerCount -= 1;
        if (this.observerCount === 0 && this.onNoObservers !== undefined) {
            this.onNoObservers(this);
        }
    }
    forEachObserver(fn) {
        if (this.finalized) {
            // Already closed by previous event....just eat the additional values.
            return;
        }
        // Since sendOne calls asynchronously - there is no chance that
        // this.observers will become undefined.
        for (let i = 0; i < this.observers.length; i++) {
            this.sendOne(i, fn);
        }
    }
    // Call the Observer via one of it's callback function. We are careful to
    // confirm that the observe has not been unsubscribed since this asynchronous
    // function had been queued.
    sendOne(i, fn) {
        // Execute the callback asynchronously
        // eslint-disable-next-line @typescript-eslint/no-floating-promises
        this.task.then(() => {
            if (this.observers !== undefined && this.observers[i] !== undefined) {
                try {
                    fn(this.observers[i]);
                }
                catch (e) {
                    // Ignore exceptions raised in Observers or missing methods of an
                    // Observer.
                    // Log error to console. b/31404806
                    if (typeof console !== 'undefined' && console.error) {
                        console.error(e);
                    }
                }
            }
        });
    }
    close(err) {
        if (this.finalized) {
            return;
        }
        this.finalized = true;
        if (err !== undefined) {
            this.finalError = err;
        }
        // Proxy is no longer needed - garbage collect references
        // eslint-disable-next-line @typescript-eslint/no-floating-promises
        this.task.then(() => {
            this.observers = undefined;
            this.onNoObservers = undefined;
        });
    }
}
/** Turn synchronous function into one called asynchronously. */
// eslint-disable-next-line @typescript-eslint/ban-types
function async(fn, onError) {
    return (...args) => {
        Promise.resolve(true)
            .then(() => {
            fn(...args);
        })
            .catch((error) => {
            if (onError) {
                onError(error);
            }
        });
    };
}
/**
 * Return true if the object passed in implements any of the named methods.
 */
function implementsAnyMethods(obj, methods) {
    if (typeof obj !== 'object' || obj === null) {
        return false;
    }
    for (const method of methods) {
        if (method in obj && typeof obj[method] === 'function') {
            return true;
        }
    }
    return false;
}
function noop() {
    // do nothing
}

/**
 * @license
 * Copyright 2019 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * The amount of milliseconds to exponentially increase.
 */
const DEFAULT_INTERVAL_MILLIS = 1000;
/**
 * The factor to backoff by.
 * Should be a number greater than 1.
 */
const DEFAULT_BACKOFF_FACTOR = 2;
/**
 * The maximum milliseconds to increase to.
 *
 * <p>Visible for testing
 */
const MAX_VALUE_MILLIS = 4 * 60 * 60 * 1000; // Four hours, like iOS and Android.
/**
 * The percentage of backoff time to randomize by.
 * See
 * http://go/safe-client-behavior#step-1-determine-the-appropriate-retry-interval-to-handle-spike-traffic
 * for context.
 *
 * <p>Visible for testing
 */
const RANDOM_FACTOR = 0.5;
/**
 * Based on the backoff method from
 * https://github.com/google/closure-library/blob/master/closure/goog/math/exponentialbackoff.js.
 * Extracted here so we don't need to pass metadata and a stateful ExponentialBackoff object around.
 */
function calculateBackoffMillis(backoffCount, intervalMillis = DEFAULT_INTERVAL_MILLIS, backoffFactor = DEFAULT_BACKOFF_FACTOR) {
    // Calculates an exponentially increasing value.
    // Deviation: calculates value from count and a constant interval, so we only need to save value
    // and count to restore state.
    const currBaseValue = intervalMillis * Math.pow(backoffFactor, backoffCount);
    // A random "fuzz" to avoid waves of retries.
    // Deviation: randomFactor is required.
    const randomWait = Math.round(
    // A fraction of the backoff value to add/subtract.
    // Deviation: changes multiplication order to improve readability.
    RANDOM_FACTOR *
        currBaseValue *
        // A random float (rounded to int by Math.round above) in the range [-1, 1]. Determines
        // if we add or subtract.
        (Math.random() - 0.5) *
        2);
    // Limits backoff to max to avoid effectively permanent backoff.
    return Math.min(MAX_VALUE_MILLIS, currBaseValue + randomWait);
}

/**
 * @license
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Provide English ordinal letters after a number
 */
function ordinal(i) {
    if (!Number.isFinite(i)) {
        return `${i}`;
    }
    return i + indicator(i);
}
function indicator(i) {
    i = Math.abs(i);
    const cent = i % 100;
    if (cent >= 10 && cent <= 20) {
        return 'th';
    }
    const dec = i % 10;
    if (dec === 1) {
        return 'st';
    }
    if (dec === 2) {
        return 'nd';
    }
    if (dec === 3) {
        return 'rd';
    }
    return 'th';
}

export { CONSTANTS, DecodeBase64StringError, Deferred, ErrorFactory, FirebaseError, MAX_VALUE_MILLIS, RANDOM_FACTOR, Sha1, areCookiesEnabled, assert, assertionError, async, base64, base64Decode, base64Encode, base64urlEncodeWithoutPadding, calculateBackoffMillis, contains, createMockUserToken, createSubscribe, decode, deepCopy, deepEqual, deepExtend, errorPrefix, extractQuerystring, getDefaultAppConfig, getDefaultEmulatorHost, getDefaultEmulatorHostnameAndPort, getDefaults, getExperimentalSetting, getGlobal, getModularInstance, getUA, isAdmin, isBrowser, isBrowserExtension, isElectron, isEmpty, isIE, isIndexedDBAvailable, isMobileCordova, isNode, isNodeSdk, isReactNative, isSafari, isUWP, isValidFormat, isValidTimestamp, issuedAtTime, jsonEval, map, ordinal, promiseWithTimeout, querystring, querystringDecode, safeGet, stringLength, stringToByteArray, stringify, uuidv4, validateArgCount, validateCallback, validateContextObject, validateIndexedDBOpenable, validateNamespace };
//# sourceMappingURL=index.esm2017.js.map

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