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Viewing file:     Function.js (2.31 KB)      -rw-r--r--

/**
 * @license
 * Copyright 2023 Google Inc.
 * SPDX-License-Identifier: Apache-2.0
 */
const createdFunctions = new Map();
/**
 * Creates a function from a string.
 *
 * @internal
 */
export const createFunction = (functionValue) => {
    let fn = createdFunctions.get(functionValue);
    if (fn) {
        return fn;
    }
    fn = new Function(`return ${functionValue}`)();
    createdFunctions.set(functionValue, fn);
    return fn;
};
/**
 * @internal
 */
export function stringifyFunction(fn) {
    let value = fn.toString();
    try {
        new Function(`(${value})`);
    }
    catch (err) {
        if (err.message.includes(`Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive`)) {
            // The content security policy does not allow Function eval. Let's
            // assume the value might be valid as is.
            return value;
        }
        // This means we might have a function shorthand (e.g. `test(){}`). Let's
        // try prefixing.
        let prefix = 'function ';
        if (value.startsWith('async ')) {
            prefix = `async ${prefix}`;
            value = value.substring('async '.length);
        }
        value = `${prefix}${value}`;
        try {
            new Function(`(${value})`);
        }
        catch {
            // We tried hard to serialize, but there's a weird beast here.
            throw new Error('Passed function cannot be serialized!');
        }
    }
    return value;
}
/**
 * Replaces `PLACEHOLDER`s with the given replacements.
 *
 * All replacements must be valid JS code.
 *
 * @example
 *
 * ```ts
 * interpolateFunction(() => PLACEHOLDER('test'), {test: 'void 0'});
 * // Equivalent to () => void 0
 * ```
 *
 * @internal
 */
export const interpolateFunction = (fn, replacements) => {
    let value = stringifyFunction(fn);
    for (const [name, jsValue] of Object.entries(replacements)) {
        value = value.replace(new RegExp(`PLACEHOLDER\\(\\s*(?:'${name}'|"${name}")\\s*\\)`, 'g'), 
        // Wrapping this ensures tersers that accidentally inline PLACEHOLDER calls
        // are still valid. Without, we may get calls like ()=>{...}() which is
        // not valid.
        `(${jsValue})`);
    }
    return createFunction(value);
};
//# sourceMappingURL=Function.js.map