51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
import path from "path";
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import {
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convertCamelToUpperSnakeCase,
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getDirname,
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readJsonIfExists,
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} from "./utils";
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export default <T>(
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opts: Partial<T>,
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envKey: string,
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localDefaultFilePath = ""
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) => {
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const { env } = process,
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{ __dirname } = getDirname(),
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def = readJsonIfExists(
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path.join(__dirname, localDefaultFilePath || "./defaults.json5")
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),
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// gets value from ENV || options || defaults (in that order)
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getVal = (envName: keyof T) => {
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const snakeEnvName = `${envKey}_${convertCamelToUpperSnakeCase(
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envName as string
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)}`;
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if (env[snakeEnvName]) return env[snakeEnvName];
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if (opts[envName]) return opts[envName];
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return def[envName];
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},
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// gets array from ENV || options || defaults (in that order)
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getArray = (envName: keyof T, optName: keyof T | "" = "") => {
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let newEnvName;
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if (optName === "") {
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optName = envName;
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newEnvName = convertCamelToUpperSnakeCase(envName as string);
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}
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newEnvName = `${envKey}_${String(envName)}`;
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if (env[newEnvName])
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return env?.[newEnvName as keyof typeof env]?.split(path.delimiter);
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if (Array.isArray(opts[optName]) && (opts[optName] as []).length)
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return opts[optName];
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return def[optName];
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};
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return {
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...Object.keys(def).reduce((acc: Partial<typeof def>, curr) => {
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if (Array.isArray(def[curr])) acc[curr] = getArray(curr as keyof T);
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else acc[curr] = getVal(curr as keyof T);
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return acc;
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}, {}),
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};
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};
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