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load-app-config.ts
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load-app-config.ts
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import { pathToFileURL } from "node:url";
import { resolveAppConfigModulePath } from "./resolve-app-config-path.js";
export type AppConfigModule = {
PORT?: number;
};
type ImportedModuleShape = Record<string, unknown>;
function isRecord(value: unknown): value is ImportedModuleShape {
return typeof value === "object" && value !== null;
}
function hasOwnPortProperty(
value: ImportedModuleShape
): value is ImportedModuleShape & { PORT?: unknown } {
return Object.hasOwn(value, "PORT");
}
function isAppConfigModule(value: unknown): value is AppConfigModule {
if (!isRecord(value) || !hasOwnPortProperty(value)) {
return false;
}
const port = value.PORT;
return port === undefined || typeof port === "number";
}
function toPlainAppConfig(candidate: AppConfigModule): AppConfigModule {
return candidate.PORT === undefined ? {} : { PORT: candidate.PORT };
}
function pickAppConfigModule(exported: unknown): AppConfigModule | null {
const visited = new Set<unknown>();
const queue: unknown[] = [exported];
while (queue.length > 0) {
const candidate = queue.shift();
if (candidate === undefined || visited.has(candidate)) {
continue;
}
visited.add(candidate);
if (isAppConfigModule(candidate)) {
return toPlainAppConfig(candidate);
}
if (isRecord(candidate)) {
if ("default" in candidate) {
queue.push(candidate.default);
}
if ("config" in candidate) {
queue.push(candidate.config);
}
}
}
return null;
}
type ModuleError = {
code?: string;
errno?: number | string;
message?: string;
};
function isMissingModuleError(error: unknown): boolean {
if (typeof error !== "object" || error === null) {
return false;
}
const { code, errno, message } = error as ModuleError;
if (code === "ENOENT" || code === "ERR_MODULE_NOT_FOUND") {
return true;
}
if (errno === "ENOENT") {
return true;
}
if (typeof message === "string") {
return message.includes("Cannot find module");
}
return false;
}
export async function loadAppConfigModule(
projectDir: string
): Promise<AppConfigModule | null> {
const modulePath = resolveAppConfigModulePath(projectDir);
try {
const moduleUrl = `${pathToFileURL(modulePath).href}?t=${Date.now()}`;
const importedModule: unknown = await import(moduleUrl);
return pickAppConfigModule(importedModule);
} catch (error) {
if (isMissingModuleError(error)) {
return null;
}
throw error;
}
}

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load-app-config.ts (2 KB)

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