envase/dist/cli/extract-envvars.js

Type-safe environment variable validation with Standard Schema compliance

const isStandardJsonSchema = (value) => {
    return (value !== null &&
        typeof value === 'object' &&
        '~standard' in value &&
        value['~standard'] !== null &&
        typeof value['~standard'] === 'object' &&
        'jsonSchema' in value['~standard']);
};
/**
 * Extracts all envvar entries from a nested envase schema.
 * Recursively traverses the schema tree to find all [name, schema] tuples.
 */
export const extractEnvvars = (schema, path = []) => {
    const extractedEnvvars = [];
    for (const [key, value] of Object.entries(schema)) {
        if (Array.isArray(value)) {
            const [envName, standardSchema] = value;
            if (!isStandardJsonSchema(standardSchema)) {
                const combinedPath = [...path, key].join('.');
                throw new Error(`Path "${combinedPath}" does not contain a valid standard json schema`);
            }
            extractedEnvvars.push({
                envName,
                path,
                schema: standardSchema,
            });
        }
        else {
            extractedEnvvars.push(...extractEnvvars(value, [...path, key]));
        }
    }
    return extractedEnvvars;
};
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