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feat: support dotenv.override #190

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feat: support dotenv.override #190

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a6f0d5e
implement override functionality to dotenv setup and load functions
abhi12299 Sep 11, 2024
d402ff6
refactor override changes
abhi12299 Oct 5, 2024
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23 changes: 20 additions & 3 deletions src/dotenv.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,12 @@ export interface DotenvOptions {
*/

env?: NodeJS.ProcessEnv;

/**
* When set to `true`, any existing environment variables will be overridden.
* Defaults to `false`.
*/
override?: boolean;
}

export type Env = typeof process.env;
Expand All @@ -49,12 +55,15 @@ export async function setupDotenv(options: DotenvOptions): Promise<Env> {
fileName: options.fileName ?? ".env",
env: targetEnvironment,
interpolate: options.interpolate ?? true,
override: options.override ?? false,
});

// Fill process.env
for (const key in environment) {
if (!key.startsWith("_") && targetEnvironment[key] === undefined) {
targetEnvironment[key] = environment[key];
if (!key.startsWith("_")) {
if (options.override || targetEnvironment[key] === undefined) {
targetEnvironment[key] = environment[key];
}
}
}

Expand All @@ -74,7 +83,15 @@ export async function loadDotenv(options: DotenvOptions): Promise<Env> {

// Apply process.env
if (!options.env?._applied) {
Object.assign(environment, options.env);
if (options.override && options.env) {
for (const key in options.env) {
if (!(key in environment) && !key.startsWith("_")) {
environment[key] = options.env[key];
}
}
} else {
Object.assign(environment, options.env);
}
environment._applied = true;
}

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