You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
34 lines
1.1 KiB
34 lines
1.1 KiB
const isProduction: boolean = process.env.NODE_ENV === 'production';
|
|
const prefix: string = 'Invariant failed';
|
|
|
|
// Throw an error if the condition fails
|
|
// Strip out error messages for production
|
|
// > Not providing an inline default argument for message as the result is smaller
|
|
export default function invariant(
|
|
condition: any,
|
|
// Can provide a string, or a function that returns a string for cases where
|
|
// the message takes a fair amount of effort to compute
|
|
message?: string | (() => string),
|
|
): asserts condition {
|
|
if (condition) {
|
|
return;
|
|
}
|
|
// Condition not passed
|
|
|
|
// In production we strip the message but still throw
|
|
if (isProduction) {
|
|
throw new Error(prefix);
|
|
}
|
|
|
|
// When not in production we allow the message to pass through
|
|
// *This block will be removed in production builds*
|
|
|
|
const provided: string | undefined = typeof message === 'function' ? message() : message;
|
|
|
|
// Options:
|
|
// 1. message provided: `${prefix}: ${provided}`
|
|
// 2. message not provided: prefix
|
|
const value: string = provided ? `${prefix}: ${provided}` : prefix;
|
|
throw new Error(value);
|
|
}
|