53 lines
2.0 KiB
TypeScript
53 lines
2.0 KiB
TypeScript
type EnvVariable = { key: string; value: string };
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class EnvStringParser {
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/**
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* Parses an environment string into a key-value object.
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* @param envString - The environment string to parse.
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* @param env - Optional custom environment variables (defaults to `process.env` in Node.js).
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* @returns A Record<string, string> containing parsed environment variables.
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*/
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static parse(envString: string, env: Record<string, string | undefined> = process.env): Record<string, string> {
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const envVars: EnvVariable[] = [];
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// Split the string into lines
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const lines = envString.split(/\r?\n/); // Handle both \n and \r\n line endings
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for (const line of lines) {
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const trimmedLine = line.trim();
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// Skip comments and empty lines
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if (!trimmedLine || trimmedLine.startsWith("#")) continue;
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// Match key-value pairs with support for quoted values
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const match = trimmedLine.match(/^([\w.-]+)=(?:"([^"]*)"|'([^']*)'|([^#\s]*))/);
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if (!match) {
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console.warn(`Skipping invalid line: ${trimmedLine}`);
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continue;
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}
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const key = match[1];
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let value = match[2] || match[3] || match[4] || ""; // Handle double quotes, single quotes, or unquoted values
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// Resolve environment variable placeholders like ${VAR_NAME}
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value = value.replace(/\$\{(\w+)\}/g, (_, varName) => {
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if (env[varName]) {
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return env[varName]!;
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} else {
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console.warn(`Environment variable ${varName} is not defined`);
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return "";
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}
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});
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envVars.push({ key, value });
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}
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// Convert array of EnvVariable objects into a Record<string, string>
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const envObj: Record<string, string> = {};
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for (const { key, value } of envVars) {
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envObj[key] = value;
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}
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return envObj;
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}
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}
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export default EnvStringParser; |