Fix typing

Typescript thinks that errors could possible be undefined.

Author: ning-y

src/slang/utils/__tests__/rttc.ts

@@ -31,7 +31,7 @@ test('Invalid unary type combinations return TypeError', () => {
   const context = mockRuntimeContext()
   const errors = operatorValue.map(opVals => {
     return rttc.checkUnaryExpression(context, opVals[0] as UnaryOperator, opVals[1])
-  })
+  }) as rttc.TypeError[]
   errors.map(error => expect(error).toBeInstanceOf(rttc.TypeError))
   errors.map(error => expect(error.explain()).toMatchSnapshot())
   errors.map(error => expect(error.elaborate()).toMatchSnapshot())
@@ -66,7 +66,7 @@ test('Invalid binary type combinations for + return TypeError', () => {
   const context = mockRuntimeContext()
   const errors = operatorValues.map(opVals => {
     return rttc.checkBinaryExpression(context, opVals[0] as BinaryOperator, opVals[1], opVals[2])
-  })
+  }) as rttc.TypeError[]
   errors.map(error => expect(error).toBeInstanceOf(rttc.TypeError))
   errors.map(error => expect(error.explain()).toMatchSnapshot())
   errors.map(error => expect(error.elaborate()).toMatchSnapshot())
@@ -131,7 +131,7 @@ test('Invalid binary type combinations for (-|*|/|%) return TypeError', () => {
   const context = mockRuntimeContext()
   const errors = operatorValues.map(opVals => {
     return rttc.checkBinaryExpression(context, opVals[0] as BinaryOperator, opVals[1], opVals[2])
-  })
+  }) as rttc.TypeError[]
   errors.map(error => expect(error).toBeInstanceOf(rttc.TypeError))
   errors.map(error => expect(error.explain()).toMatchSnapshot())
   errors.map(error => expect(error.elaborate()).toMatchSnapshot())
@@ -175,7 +175,7 @@ test('Invalid binary type combinations for (<|>|<==|>==) return TypeError', () =
   const context = mockRuntimeContext()
   const errors = operatorValues.map(opVals => {
     return rttc.checkBinaryExpression(context, opVals[0] as BinaryOperator, opVals[1], opVals[2])
-  })
+  }) as rttc.TypeError[]
   errors.map(error => expect(error).toBeInstanceOf(rttc.TypeError))
   errors.map(error => expect(error.explain()).toMatchSnapshot())
   errors.map(error => expect(error.elaborate()).toMatchSnapshot())
@@ -203,7 +203,7 @@ test('Invalid logical type combinations return TypeError', () => {
   const context = mockRuntimeContext()
   const errors = operatorValues.map(opVals => {
     return rttc.checkLogicalExpression(context, opVals[0], opVals[1])
-  })
+  }) as rttc.TypeError[]
   errors.map(error => expect(error).toBeInstanceOf(rttc.TypeError))
   errors.map(error => expect(error.explain()).toMatchSnapshot())
   errors.map(error => expect(error.elaborate()).toMatchSnapshot())
@@ -219,7 +219,9 @@ test('Valid ternary/if test expressions are OK', () => {
 test('Invalid ternary/if test expressions return TypeError', () => {
   const operatorValues = [num, str, func]
   const context = mockRuntimeContext()
-  const errors = operatorValues.map(opVal => rttc.checkIfStatement(context, opVal))
+  const errors = operatorValues.map(opVal => {
+    return rttc.checkIfStatement(context, opVal)
+  }) as rttc.TypeError[]
   errors.map(error => expect(error).toBeInstanceOf(rttc.TypeError))
   errors.map(error => expect(error.explain()).toMatchSnapshot())
   errors.map(error => expect(error.elaborate()).toMatchSnapshot())