Improve the handling of map options

maplibre · May 21, 2024 · a471e7c · a471e7c
1 parent 4b6c9c2
commit a471e7c
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diff --git a/src/types/util.ts b/src/types/util.ts
@@ -0,0 +1,25 @@
+/**
+ * Makes optional keys required and add the the undefined type.
+ *
+ * ```
+ * interface Test {
+ *  foo: number;
+ *  bar?: number;
+ *  baz: number | undefined;
+ * }
+ *
+ * Complete<Test> {
+ *  foo: number;
+ *  bar: number | undefined;
+ *  baz: number | undefined;
+ * }
+ *
+ * ```
+ *
+ * See https://medium.com/terria/typescript-transforming-optional-properties-to-required-properties-that-may-be-undefined-7482cb4e1585
+ */
+
+export type Complete<T> = {
+    [P in keyof Required<T>]: Pick<T, P> extends Required<Pick<T, P>> ? T[P] : (T[P] | undefined);
+}
+