diff --git a/lib/src/compiler/async.ts b/lib/src/compiler/async.ts
index bd559c13..0fcc64f1 100644
--- a/lib/src/compiler/async.ts
+++ b/lib/src/compiler/async.ts
@@ -98,7 +98,7 @@ export class AsyncCompiler {
   /** Guards against using a disposed compiler. */
   private throwIfDisposed(): void {
     if (this.disposed) {
-      throw utils.compilerError('Async compiler has already been disposed.');
+      throw utils.compilerError('Async compiler has already been disposed');
     }
   }
 
@@ -163,7 +163,7 @@ export class AsyncCompiler {
     if (flag !== initFlag) {
       throw utils.compilerError(
         'AsyncCompiler can not be directly constructed. ' +
-          'Please use `sass.initAsyncCompiler()` instead.',
+          'Please use `sass.initAsyncCompiler()` instead',
       );
     }
     this.stderr$.subscribe(data => process.stderr.write(data));
diff --git a/lib/src/compiler/sync.ts b/lib/src/compiler/sync.ts
index 7aeef3ab..a2e11d4a 100644
--- a/lib/src/compiler/sync.ts
+++ b/lib/src/compiler/sync.ts
@@ -154,7 +154,7 @@ export class Compiler {
 
       for (;;) {
         if (!this.yield()) {
-          throw utils.compilerError('Embedded compiler exited unexpectedly.');
+          throw utils.compilerError('Embedded compiler exited unexpectedly');
         }
 
         if (error) throw error;
@@ -168,7 +168,7 @@ export class Compiler {
   /** Guards against using a disposed compiler. */
   private throwIfDisposed(): void {
     if (this.disposed) {
-      throw utils.compilerError('Sync compiler has already been disposed.');
+      throw utils.compilerError('Sync compiler has already been disposed');
     }
   }
 
@@ -177,7 +177,7 @@ export class Compiler {
     if (flag !== initFlag) {
       throw utils.compilerError(
         'Compiler can not be directly constructed. ' +
-          'Please use `sass.initAsyncCompiler()` instead.',
+          'Please use `sass.initCompiler()` instead',
       );
     }
     this.stderr$.subscribe(data => process.stderr.write(data));
diff --git a/lib/src/compiler/utils.ts b/lib/src/compiler/utils.ts
index 098753d3..92ce8e42 100644
--- a/lib/src/compiler/utils.ts
+++ b/lib/src/compiler/utils.ts
@@ -225,7 +225,7 @@ export function handleCompileResponse(
   } else if (response.result.case === 'failure') {
     throw new Exception(response.result.value);
   } else {
-    throw utils.compilerError('Compiler sent empty CompileResponse.');
+    throw utils.compilerError('Compiler sent empty CompileResponse');
   }
 }
 
diff --git a/lib/src/deprotofy-span.ts b/lib/src/deprotofy-span.ts
index bd32762f..8e2b8867 100644
--- a/lib/src/deprotofy-span.ts
+++ b/lib/src/deprotofy-span.ts
@@ -14,20 +14,20 @@ export function deprotofySourceSpan(buffer: proto.SourceSpan): SourceSpan {
   const text = buffer.text;
 
   if (buffer.start === undefined) {
-    throw compilerError('Expected SourceSpan to have start.');
+    throw compilerError('Expected SourceSpan to have start');
   }
 
   let end;
   if (buffer.end === undefined) {
     if (text !== '') {
-      throw compilerError('Expected SourceSpan text to be empty.');
+      throw compilerError('Expected SourceSpan text to be empty');
     } else {
       end = buffer.start;
     }
   } else {
     end = buffer.end;
     if (end.offset < buffer.start.offset) {
-      throw compilerError('Expected SourceSpan end to be after start.');
+      throw compilerError('Expected SourceSpan end to be after start');
     }
   }
 
diff --git a/lib/src/protofier.ts b/lib/src/protofier.ts
index c06dfdd6..f772901f 100644
--- a/lib/src/protofier.ts
+++ b/lib/src/protofier.ts
@@ -324,7 +324,7 @@ export class Protofier {
             });
 
           default:
-            throw utils.compilerError(`Unknown color space "${color.space}".`);
+            throw utils.compilerError(`Unknown color space "${color.space}"`);
         }
       }
 
@@ -394,7 +394,7 @@ export class Protofier {
 
       case 'hostFunction':
         throw utils.compilerError(
-          'The compiler may not send Value.host_function.',
+          'The compiler may not send Value.host_function',
         );
 
       case 'compilerMixin':
@@ -454,7 +454,7 @@ export class Protofier {
       case 'calc':
         if (calculation.arguments.length !== 1) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have exactly one argument for calc().',
+            'Value.Calculation.arguments must have exactly one argument for calc()',
           );
         }
         return SassCalculation.calc(
@@ -466,7 +466,7 @@ export class Protofier {
           calculation.arguments.length > 3
         ) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have 1 to 3 arguments for clamp().',
+            'Value.Calculation.arguments must have 1 to 3 arguments for clamp()',
           );
         }
         return SassCalculation.clamp(
@@ -481,7 +481,7 @@ export class Protofier {
       case 'min':
         if (calculation.arguments.length === 0) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have at least 1 argument for min().',
+            'Value.Calculation.arguments must have at least 1 argument for min()',
           );
         }
         return SassCalculation.min(
@@ -490,7 +490,7 @@ export class Protofier {
       case 'max':
         if (calculation.arguments.length === 0) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have at least 1 argument for max().',
+            'Value.Calculation.arguments must have at least 1 argument for max()',
           );
         }
         return SassCalculation.max(
@@ -498,7 +498,7 @@ export class Protofier {
         );
       default:
         throw utils.compilerError(
-          `Value.Calculation.name "${calculation.name}" is not a recognized calculation type.`,
+          `Value.Calculation.name "${calculation.name}" is not a recognized calculation type`,
         );
     }
   }
diff --git a/lib/src/utils.ts b/lib/src/utils.ts
index 1dbbd75c..308f56a8 100644
--- a/lib/src/utils.ts
+++ b/lib/src/utils.ts
@@ -73,7 +73,7 @@ export function compilerError(message: string): Error {
  * been included but was not.
  */
 export function mandatoryError(field: string): Error {
-  return compilerError(`Missing mandatory field ${field}`);
+  return compilerError(`Missing mandatory field ${field}.`);
 }
 
 /** Constructs a host-caused Error. */
diff --git a/lib/src/value/color.ts b/lib/src/value/color.ts
index 60b2928a..c9dc79fa 100644
--- a/lib/src/value/color.ts
+++ b/lib/src/value/color.ts
@@ -249,7 +249,7 @@ function validateChannelInSpace(
   }
   if (!valid) {
     throw valueError(
-      `Unknown channel name "${channel}" for color space "${space}".`,
+      `Unknown channel name "${channel}" for color space "${space}"`,
     );
   }
 }
@@ -893,7 +893,7 @@ export class SassColor extends Value {
 
     if (weight < 0 || weight > 1) {
       throw valueError(
-        `Expected \`weight\` between \`0\` and \`1\`, received \`${weight}\`.`,
+        `Expected \`weight\` between \`0\` and \`1\`, received \`${weight}\``,
       );
     }
 
diff --git a/lib/src/value/index.ts b/lib/src/value/index.ts
index b77c3395..793d04db 100644
--- a/lib/src/value/index.ts
+++ b/lib/src/value/index.ts
@@ -86,7 +86,7 @@ export abstract class Value implements ValueObject {
     }
     if (Math.abs(index) > this.lengthAsList) {
       throw valueError(
-        `Invalid index ${sassIndex} for a list with ${this.lengthAsList} elements.`,
+        `Invalid index ${sassIndex} for a list with ${this.lengthAsList} elements`,
         name,
       );
     }
diff --git a/lib/src/value/number.ts b/lib/src/value/number.ts
index 52397e57..298c99ac 100644
--- a/lib/src/value/number.ts
+++ b/lib/src/value/number.ts
@@ -596,7 +596,7 @@ export class SassNumber extends Value {
       }
 
       if (!otherHasUnits) {
-        return valueError(`Expected ${this} to have no units.`, params.name);
+        return valueError(`Expected ${this} to have no units`, params.name);
       }
 
       // For single numerators, throw a detailed error with info about which unit
@@ -607,7 +607,7 @@ export class SassNumber extends Value {
           return valueError(
             `Expected ${this} to have a single ${type} unit (${unitsByType[
               type
-            ].join(', ')}).`,
+            ].join(', ')})`,
             params.name,
           );
         }
@@ -622,7 +622,7 @@ export class SassNumber extends Value {
                 newNumerators,
                 newDenominators,
               )}`
-        }.`,
+        }`,
         params.name,
       );
     };