Merge pull request #6 from seangwright/feat/pipeable-operators

README.md

@@ -136,6 +136,36 @@ const maybe = Maybe.none<Food>()
   }); // None!
 ```
 
+#### Pipe
+
+```typescript
+// custom-operators.ts
+import { logger, LogLevel } from 'logger';
+
+export function log<TValue>(
+  messageCreator: FunctionOfTtoK<TValue, string>,
+  logLevel: LogLevel = 'debug'
+): MaybeOpFn<TValue, TValue> {
+  return (maybe) => {
+    if (maybe.hasValue) {
+      logger.log(messageCreator(maybe.getValueOrThrow()), logLevel);
+    } else {
+      logger.error('No value found!');
+    }
+
+    return maybe;
+  };
+}
+
+// app.ts
+import { log } from './custom-operators.ts';
+
+const maybe = Maybe.some('apple')
+  .pipe(log((f) => `My fruit is ${f}`, 'information'))
+  .map((f) => `${f} and banana`)
+  .pipe(log((f) => `Now I have ${f}`));
+```
+
 ### MaybeAsync
 
 `MaybeAsync` represents a future value (`Promise`) that might or might not exist.

jest.config.js → jest.config.ts

@@ -1,5 +1,6 @@
-/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
-export default {
+import { InitialOptionsTsJest } from 'ts-jest';
+
+const config: InitialOptionsTsJest = {
   preset: 'ts-jest',
   testEnvironment: 'node',
   globals: {
@@ -14,3 +15,5 @@ export default {
   setupFilesAfterEnv: ['./test/expectExtensions.ts'],
   extensionsToTreatAsEsm: ['.ts'],
 };
+
+export default config;