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Author: nfabredev

docs/playground/fr/3-7/Fixits/Infer From Usage Changes.ts

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+//// { compiler: {  noImplicitAny: false }, order: 2 }
+
+// With 3.7 TypeScript's existing 'infer from usage'
+// code fix became smarter. It will now use a list of
+// known important types (string, number, array, Promise)
+// and infer whether the usage of a type matches the API
+// of these objects.
+
+// For the next few examples, select the parameters of
+// the functions, click the light bulb and choose
+// "Infer Parameter types..."
+
+// Infer a number array:
+
+function pushNumber(arr) {
+  arr.push(12);
+}
+
+// Infer a promise:
+
+function awaitPromise(promise) {
+  promise.then((value) => console.log(value));
+}
+
+// Infer the function, and its return type:
+
+function inferAny(app) {
+  const result = app.use("hi");
+  return result;
+}
+
+// Infer a string array because a string
+// was added to it:
+
+function insertString(names) {
+  names[1] = "hello";
+}