replace.js
f40d8f152a93drf-api-tracking

replace.js
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			'use strict';

			var jsTokens = require('js-tokens').default;

			var processEnvRe = /\bprocess\.env\.[_$a-zA-Z][$\w]+\b/;
			var spaceOrCommentRe = /^(?:\s\|\/[/*])/;

			function replace(src, envs) {
			if (!processEnvRe.test(src)) {
			return src;
			}

			var out = [];
			var purge = envs.some(function(env) {
			return env._ && env._.indexOf('purge') !== -1;
			});

			jsTokens.lastIndex = 0
			var parts = src.match(jsTokens);

			for (var i = 0; i < parts.length; i++) {
			if (parts[i ] === 'process' &&
			parts[i + 1] === '.' &&
			parts[i + 2] === 'env' &&
			parts[i + 3] === '.') {
			var prevCodeToken = getAdjacentCodeToken(-1, parts, i);
			var nextCodeToken = getAdjacentCodeToken(1, parts, i + 4);
			var replacement = getReplacementString(envs, parts[i + 4], purge);
			if (prevCodeToken !== '.' &&
			nextCodeToken !== '.' &&
			nextCodeToken !== '=' &&
			typeof replacement === 'string') {
			out.push(replacement);
			i += 4;
			continue;
			}
			}
			out.push(parts[i]);
			}

			return out.join('');
			}

			function getAdjacentCodeToken(dir, parts, i) {
			while (true) {
			var part = parts[i += dir];
			if (!spaceOrCommentRe.test(part)) {
			return part;
			}
			}
			}

			function getReplacementString(envs, name, purge) {
			for (var j = 0; j < envs.length; j++) {
			var env = envs[j];
			if (typeof env[name] !== 'undefined') {
			return JSON.stringify(env[name]);
			}
			}
			if (purge) {
			return 'undefined';
			}
			}

			module.exports = replace;