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blaswan/assert.ts

Created June 25, 2018 00:32
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  1. blaswan created this gist Jun 25, 2018.
    18 changes: 18 additions & 0 deletions assert.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,18 @@
    export const assert = (condition: boolean, messageOrError?: string | Error) => {
    if (!condition) {
    if (typeof messageOrError === "string" || typeof messageOrError === "undefined") {
    const message = messageOrError || "Assertion failed";
    if (typeof Error !== "undefined") {
    throw new Error(message);
    }
    } else {
    throw messageOrError;
    }
    }
    };

    // pass specific error
    // assert(url, new ValidationError("Required value missing: url"));

    // or pass only message
    // assert(url, "Required value missing: url");