@ng-doc/core/helpers/extract-function-defaults.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.extractFunctionDefaults = extractFunctionDefaults;
const extract_value_1 = require("./extract-value");
/**
 * Extracts the default values of a function parameters.
 * It returns an array of the default values because after minification the parameter names are lost.
 * @param fn - Function to extract the default values from
 */
function extractFunctionDefaults(fn) {
    const name = fn.name || 'function';
    return (fn
        .toString()
        // Get the parameters declaration between the parenthesis
        .match(new RegExp(`^${name}\\s*[^\\(]*\\(\\s*([^\\)]*)\\)`, 'm'))?.[1]
        // Get rid of comments
        .replace(/(\/\*[\s\S]*?\*\/)/gm, '')
        .split(',')
        // Convert it into an object
        .map((param) => {
        // Split parameter name from value
        const paramMatch = param.match(/([_$a-zA-Z][^=]*)(?:=([^=]+))?/);
        if (paramMatch) {
            // Eval each default value, to get strings, variable refs, etc.
            return (0, extract_value_1.extractValue)(paramMatch[2]);
        }
        return undefined;
    }) ?? []);
}
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