@shons/next-configify/dist/src/interpolation/variables.js

NestJS Config on Next Steroids

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Variables = void 0;
class Variables {
    static expand(record) {
        const expanded = {};
        for (const key in record) {
            const value = record[key];
            const interpolated = this.interpolate(value, record);
            expanded[key] =
                typeof interpolated === 'string'
                    ? this.escapeSequences(interpolated)
                    : interpolated;
        }
        return expanded;
    }
    static interpolate(value, record) {
        if (typeof value !== 'string')
            return value;
        const lastUnescapedDollarSignIndex = this.lastIndexOf(value, this.UNESCAPED_PATTERN);
        if (lastUnescapedDollarSignIndex === -1)
            return value;
        const rightMostGroup = value.slice(lastUnescapedDollarSignIndex);
        const match = rightMostGroup.match(this.EXPANSION_GROUP_PATTERN);
        if (match != null) {
            let [, group, variableName, defaultValue] = match;
            variableName =
                variableName.indexOf('-') !== -1
                    ? variableName.replaceAll('-', '_')
                    : variableName;
            variableName = variableName.replaceAll('.', '_').toUpperCase();
            return this.interpolate(value.replace(group, defaultValue || `${record[variableName]}` || ''), record);
        }
        return value;
    }
    static escapeSequences(value) {
        return value.replace(this.ESCAPE_PATTERN, '$');
    }
    static lastIndexOf(value, regex) {
        const matches = Array.from(value.matchAll(regex));
        return matches.length > 0 ? matches.slice(-1)[0].index : -1;
    }
}
exports.Variables = Variables;
Variables.ESCAPE_PATTERN = /\\\$/g;
Variables.UNESCAPED_PATTERN = /(?!(?<=\\))\$/g;
Variables.EXPANSION_GROUP_PATTERN = /((?!(?<=\\))\${?([\w-.]+)(?::-([^}\\]*))?}?)/;
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