fix(1250): fix bigint literal type declaration emit (microsoft#1258)

internal/checker/emitresolver.go

@@ -900,12 +900,10 @@ func (r *emitResolver) CreateLiteralConstValue(emitContext *printer.EmitContext,
 	if t.flags&TypeFlagsLiteral == 0 {
 		return nil // non-literal type
 	}
-	literalValue := t.AsLiteralType().value
-	switch literalValue.(type) {
+	switch value := t.AsLiteralType().value.(type) {
 	case string:
-		return emitContext.Factory.NewStringLiteral(literalValue.(string))
+		return emitContext.Factory.NewStringLiteral(value)
 	case jsnum.Number:
-		value := literalValue.(jsnum.Number)
 		if value.Abs() != value {
 			// negative
 			return emitContext.Factory.NewPrefixUnaryExpression(
@@ -915,20 +913,13 @@ func (r *emitResolver) CreateLiteralConstValue(emitContext *printer.EmitContext,
 		}
 		return emitContext.Factory.NewNumericLiteral(value.String())
 	case jsnum.PseudoBigInt:
-		value := literalValue.(jsnum.PseudoBigInt)
-		if value.Negative {
-			// negative
-			return emitContext.Factory.NewPrefixUnaryExpression(
-				ast.KindMinusToken,
-				emitContext.Factory.NewBigIntLiteral(value.Base10Value),
-			)
-		}
-		return emitContext.Factory.NewNumericLiteral(value.Base10Value)
+		return emitContext.Factory.NewBigIntLiteral(pseudoBigIntToString(value) + "n")
 	case bool:
-		if literalValue.(bool) {
-			return emitContext.Factory.NewKeywordExpression(ast.KindTrueKeyword)
+		kind := ast.KindFalseKeyword
+		if value {
+			kind = ast.KindTrueKeyword
 		}
-		return emitContext.Factory.NewKeywordExpression(ast.KindFalseKeyword)
+		return emitContext.Factory.NewKeywordExpression(kind)
 	}
 	panic("unhandled literal const value kind")
 }

testdata/baselines/reference/compiler/declarationEmitBigInt.js

@@ -0,0 +1,21 @@
+//// [tests/cases/compiler/declarationEmitBigInt.ts] ////
+
+//// [a.ts]
+export const a = 0n;
+export const b = 10n;
+export const c = -0n;
+export const d = -10n;
+
+
+//// [a.js]
+export const a = 0n;
+export const b = 10n;
+export const c = -0n;
+export const d = -10n;
+
+
+//// [a.d.ts]
+export declare const a = 0n;
+export declare const b = 10n;
+export declare const c = 0n;
+export declare const d = -10n;

testdata/baselines/reference/compiler/declarationEmitBigInt.symbols

@@ -0,0 +1,15 @@
+//// [tests/cases/compiler/declarationEmitBigInt.ts] ////
+
+=== a.ts ===
+export const a = 0n;
+>a : Symbol(a, Decl(a.ts, 0, 12))
+
+export const b = 10n;
+>b : Symbol(b, Decl(a.ts, 1, 12))
+
+export const c = -0n;
+>c : Symbol(c, Decl(a.ts, 2, 12))
+
+export const d = -10n;
+>d : Symbol(d, Decl(a.ts, 3, 12))
+

testdata/baselines/reference/compiler/declarationEmitBigInt.types

@@ -0,0 +1,21 @@
+//// [tests/cases/compiler/declarationEmitBigInt.ts] ////
+
+=== a.ts ===
+export const a = 0n;
+>a : 0n
+>0n : 0n
+
+export const b = 10n;
+>b : 10n
+>10n : 10n
+
+export const c = -0n;
+>c : 0n
+>-0n : 0n
+>0n : 0n
+
+export const d = -10n;
+>d : -10n
+>-10n : -10n
+>10n : 10n
+

testdata/baselines/reference/submodule/compiler/bigintWithLib.js

@@ -134,7 +134,7 @@ declare let bigUintArray: BigUint64Array;
 // Test added DataView methods
 declare const dataView: DataView<ArrayBuffer>;
 // Test emitted declarations files
-declare const w = 12; // should emit as const w = 12n
-declare const x = -12; // should emit as const x = -12n
+declare const w = 12n; // should emit as const w = 12n
+declare const x = -12n; // should emit as const x = -12n
 declare const y: 12n; // should emit type 12n
 declare let z: bigint; // should emit type bigint in declaration file

testdata/baselines/reference/submodule/compiler/bigintWithLib.js.diff

@@ -20,7 +20,7 @@
 -declare const y: 12n;
 -declare let z: bigint;
 +// Test emitted declarations files
-+declare const w = 12; // should emit as const w = 12n
-+declare const x = -12; // should emit as const x = -12n
++declare const w = 12n; // should emit as const w = 12n
++declare const x = -12n; // should emit as const x = -12n
 +declare const y: 12n; // should emit type 12n
 +declare let z: bigint; // should emit type bigint in declaration file

testdata/baselines/reference/submodule/compiler/isolatedDeclarationErrorsExpressions.js

@@ -242,10 +242,10 @@ export declare const numberConst = 1;
 export declare const numberConstBad1: number;
 export declare const numberConstBad2: number;
 export declare const numberConstBad3 = 1;
-export declare const bigIntConst = 1;
+export declare const bigIntConst = 1n;
 export declare const bigIntConstBad1: bigint;
 export declare const bigIntConstBad2: bigint;
-export declare const bigIntConstBad3 = 1;
+export declare const bigIntConstBad3 = 1n;
 export declare const stringConst = "s";
 export declare const stringConstBad: string;
 // These are just strings

testdata/baselines/reference/submodule/compiler/isolatedDeclarationErrorsExpressions.js.diff

@@ -11,10 +11,10 @@
 +export declare const numberConstBad1: number;
 +export declare const numberConstBad2: number;
 +export declare const numberConstBad3 = 1;
-+export declare const bigIntConst = 1;
++export declare const bigIntConst = 1n;
 +export declare const bigIntConstBad1: bigint;
 +export declare const bigIntConstBad2: bigint;
-+export declare const bigIntConstBad3 = 1;
++export declare const bigIntConstBad3 = 1n;
 +export declare const stringConst = "s";
 +export declare const stringConstBad: string;
 +// These are just strings

testdata/baselines/reference/submodule/compiler/isolatedDeclarationsLiterals.js

@@ -154,8 +154,8 @@ export declare const oneOctal = 1;
 export declare const oneHex = 1;
 export declare const pOne = 1;
 export declare const mOne = -1;
-export declare const onen = 1;
-export declare const mOnen = -1;
+export declare const onen = 1n;
+export declare const mOnen = -1n;
 export declare const oneStrDoubleQuote = "1";
 export declare const oneStrSingleQuote = "1";
 export declare const oneStrTemplate = "1";

testdata/tests/cases/compiler/declarationEmitBigInt.ts

@@ -0,0 +1,7 @@
+// @target: es2020
+// @declaration: true
+// @filename: a.ts
+export const a = 0n;
+export const b = 10n;
+export const c = -0n;
+export const d = -10n;