unleash-server/dist/lib/util/parseEnvVar.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import { PayloadType } from 'unleash-client';
export function parseEnvVarNumber(envVar, defaultVal) {
    if (!envVar) {
        return defaultVal;
    }
    const parsed = Number.parseInt(envVar, 10);
    if (Number.isNaN(parsed)) {
        return defaultVal;
    }
    return parsed;
}
export function parseEnvVarBoolean(envVar, defaultVal) {
    if (envVar) {
        return envVar === 'true' || envVar === '1' || envVar === 't';
    }
    return defaultVal;
}
export function parseEnvVarStrings(envVar, defaultVal) {
    if (typeof envVar === 'string') {
        return envVar
            .split(',')
            .map((item) => item.trim())
            .filter(Boolean);
    }
    return defaultVal;
}
export function parseEnvVarJSON(envVar, defaultVal) {
    if (envVar) {
        try {
            return JSON.parse(envVar);
        }
        catch (_e) {
            return defaultVal;
        }
    }
    return defaultVal;
}
export function parseEnvVarBooleanOrStringVariant(envVar, defaultVal) {
    if (!envVar) {
        return defaultVal;
    }
    if (envVar === '1' || envVar === 't' || envVar === 'true') {
        return true;
    }
    if (envVar === '0' || envVar === 'f' || envVar === 'false') {
        return false;
    }
    return {
        name: 'Variant',
        enabled: true,
        payload: {
            type: PayloadType.STRING,
            value: envVar,
        },
    };
}
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