deepseek-harness/packages/test-support/client-runtime/src/translate.ts

/**
 * Test double of the locale lookup chain: a translate stub over plain
 * dictionaries, mirroring LocaleRuntime's resolution order (first dictionary
 * that owns the key wins, then the key itself stays visible) and its
 * `{name}` template interpolation. Specs stub the framework-injected `t`
 * seat with `makeTranslate(zh, commonZh)` instead of re-implementing the
 * chain per suite.
 */

/**
 * Build a translate stub resolving through `dicts` in order (namespace
 * first, then the shared common vocabulary), falling back to the key.
 * @param dicts - dictionaries consulted in order.
 * @returns the translate function (assignable to any `XxxProps['t']` seat).
 */
export function makeTranslate(
  ...dicts: readonly Record<string, string>[]
): (key: string, params?: Record<string, unknown>) => string {
  return (key, params) => {
    let template = key
    for (const dict of dicts) {
      const hit = dict[key]
      if (hit !== undefined) {
        template = hit
        break
      }
    }
    if (!params) return template
    return template.replace(/\{(\w+)\}/g, (match, name: string) =>
      name in params ? String(params[name]) : match)
  }
}