src/vs/workbench/services/extensions/node/extensionPoints.ts/ExtensionManifestValidator/_isStringArray
class ExtensionManifestValidator:	private static _isStringArray(arr: string[]): boolean {
		if (!Array.isArray(arr)) {
			return false;
		}
		for (let i = 0, len = arr.length; i < len; i++) {
			if (typeof arr[i] !== 'string') {
				return false;
			}
		}
		return true;
	}