Add test

Author: jakebailey

tests/baselines/reference/declarationEmitBindingPatternsUnused.js

@@ -0,0 +1,37 @@
+//// [tests/cases/compiler/declarationEmitBindingPatternsUnused.ts] ////
+
+//// [declarationEmitBindingPatternsUnused.ts]
+function shouldNotKeep({ name: alias }: { name: string }) {
+
+}
+
+function shouldNotKeepButIsKept({ name: alias }: { name: string }) {
+    return alias;
+}
+
+function shouldKeep({ name: alias }: { name: string }): typeof alias {
+    return alias;
+}
+
+
+//// [declarationEmitBindingPatternsUnused.js]
+function shouldNotKeep({ name: alias }) {
+}
+function shouldNotKeepButIsKept({ name: alias }) {
+    return alias;
+}
+function shouldKeep({ name: alias }) {
+    return alias;
+}
+
+
+//// [declarationEmitBindingPatternsUnused.d.ts]
+declare function shouldNotKeep({ name }: {
+    name: string;
+}): void;
+declare function shouldNotKeepButIsKept({ name: alias }: {
+    name: string;
+}): string;
+declare function shouldKeep({ name: alias }: {
+    name: string;
+}): typeof alias;

tests/baselines/reference/declarationEmitBindingPatternsUnused.symbols

@@ -0,0 +1,32 @@
+//// [tests/cases/compiler/declarationEmitBindingPatternsUnused.ts] ////
+
+=== declarationEmitBindingPatternsUnused.ts ===
+function shouldNotKeep({ name: alias }: { name: string }) {
+>shouldNotKeep : Symbol(shouldNotKeep, Decl(declarationEmitBindingPatternsUnused.ts, 0, 0))
+>name : Symbol(name, Decl(declarationEmitBindingPatternsUnused.ts, 0, 41))
+>alias : Symbol(alias, Decl(declarationEmitBindingPatternsUnused.ts, 0, 24))
+>name : Symbol(name, Decl(declarationEmitBindingPatternsUnused.ts, 0, 41))
+
+}
+
+function shouldNotKeepButIsKept({ name: alias }: { name: string }) {
+>shouldNotKeepButIsKept : Symbol(shouldNotKeepButIsKept, Decl(declarationEmitBindingPatternsUnused.ts, 2, 1))
+>name : Symbol(name, Decl(declarationEmitBindingPatternsUnused.ts, 4, 50))
+>alias : Symbol(alias, Decl(declarationEmitBindingPatternsUnused.ts, 4, 33))
+>name : Symbol(name, Decl(declarationEmitBindingPatternsUnused.ts, 4, 50))
+
+    return alias;
+>alias : Symbol(alias, Decl(declarationEmitBindingPatternsUnused.ts, 4, 33))
+}
+
+function shouldKeep({ name: alias }: { name: string }): typeof alias {
+>shouldKeep : Symbol(shouldKeep, Decl(declarationEmitBindingPatternsUnused.ts, 6, 1))
+>name : Symbol(name, Decl(declarationEmitBindingPatternsUnused.ts, 8, 38))
+>alias : Symbol(alias, Decl(declarationEmitBindingPatternsUnused.ts, 8, 21))
+>name : Symbol(name, Decl(declarationEmitBindingPatternsUnused.ts, 8, 38))
+>alias : Symbol(alias, Decl(declarationEmitBindingPatternsUnused.ts, 8, 21))
+
+    return alias;
+>alias : Symbol(alias, Decl(declarationEmitBindingPatternsUnused.ts, 8, 21))
+}
+

tests/baselines/reference/declarationEmitBindingPatternsUnused.types

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+//// [tests/cases/compiler/declarationEmitBindingPatternsUnused.ts] ////
+
+=== declarationEmitBindingPatternsUnused.ts ===
+function shouldNotKeep({ name: alias }: { name: string }) {
+>shouldNotKeep : ({ name: alias }: {    name: string;}) => void
+>name : any
+>alias : string
+>name : string
+
+}
+
+function shouldNotKeepButIsKept({ name: alias }: { name: string }) {
+>shouldNotKeepButIsKept : ({ name: alias }: {    name: string;}) => string
+>name : any
+>alias : string
+>name : string
+
+    return alias;
+>alias : string
+}
+
+function shouldKeep({ name: alias }: { name: string }): typeof alias {
+>shouldKeep : ({ name: alias }: {    name: string;}) => typeof alias
+>name : any
+>alias : string
+>name : string
+>alias : string
+
+    return alias;
+>alias : string
+}
+

tests/cases/compiler/declarationEmitBindingPatternsUnused.ts

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+// @declaration: true
+// @target: esnext
+// @skipLibCheck: false
+
+function shouldNotKeep({ name: alias }: { name: string }) {
+
+}
+
+function shouldNotKeepButIsKept({ name: alias }: { name: string }) {
+    return alias;
+}
+
+function shouldKeep({ name: alias }: { name: string }): typeof alias {
+    return alias;
+}