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hwe/ts/util.ts

@@ -0,0 +1,35 @@
+type ErrType<T> = { new(msg?: string): T }
+type Nullable<T> = T | null | undefined
+
+export class RuntimeError extends Error {
+    public name = 'RuntimeError';
+    constructor(public message: string = '') {
+        super(message);
+    }
+    toString(): string {
+        if (this.message) {
+            return this.name + ': ' + this.message;
+        }
+        else {
+            return this.name;
+        }
+    }
+}
+
+export class NotNullExpected extends RuntimeError {
+    public name = 'NotNullExpected';
+}
+
+export function unwrap<T>(result: Nullable<T>): T {
+    if (result === null || result === undefined) {
+        throw new NotNullExpected();
+    }
+    return result;
+}
+
+export function unwrap_err<T, ErrT extends Error>(result: Nullable<T>, errType: ErrType<ErrT>, errMsg?: string): T {
+    if (result === null || result === undefined) {
+        throw new errType(errMsg);
+    }
+    return result;
+}