Enable useDefineForClassFields and fix affected TS files. (#2447)

* Enable useDefineForClassFields and fix affected TS files.

Fixes #2419

Turning off this TS compiler option is deprecated, and it will be removed "soon". It's annoying.. but oh well.

Author: Goodwine

pkg/sass-parser/lib/src/configured-variable.ts

@@ -100,7 +100,7 @@ export class ConfiguredVariable extends Node {
    * This is the parsed and normalized value, with underscores converted to
    * hyphens and escapes resolved to the characters they represent.
    */
-  name!: string;
+  declare name: string;
 
   /** The expresison whose value the variable is assigned. */
   get expression(): Expression {
@@ -112,10 +112,10 @@ export class ConfiguredVariable extends Node {
     if (value) value.parent = this;
     this._expression = value;
   }
-  private _expression!: Expression;
+  private declare _expression: Expression;
 
   /** Whether this has a `!default` guard. */
-  guarded!: boolean;
+  declare guarded: boolean;
 
   constructor(defaults: ConfiguredVariableProps);
   /** @hidden */

pkg/sass-parser/lib/src/expression/binary-operation.ts

@@ -76,7 +76,7 @@ export class BinaryOperationExpression extends Expression {
     // TODO - postcss/postcss#1957: Mark this as dirty
     this._operator = operator;
   }
-  private _operator!: BinaryOperator;
+  private declare _operator: BinaryOperator;
 
   /** The expression on the left-hand side of this operation. */
   get left(): Expression {
@@ -89,7 +89,7 @@ export class BinaryOperationExpression extends Expression {
     left.parent = this;
     this._left = left;
   }
-  private _left!: Expression;
+  private declare _left: Expression;
 
   /** The expression on the right-hand side of this operation. */
   get right(): Expression {
@@ -102,7 +102,7 @@ export class BinaryOperationExpression extends Expression {
     right.parent = this;
     this._right = right;
   }
-  private _right!: Expression;
+  private declare _right: Expression;
 
   constructor(defaults: BinaryOperationExpressionProps);
   /** @hidden */

pkg/sass-parser/lib/src/expression/boolean.ts

@@ -44,7 +44,7 @@ export class BooleanExpression extends Expression {
     // TODO - postcss/postcss#1957: Mark this as dirty
     this._value = value;
   }
-  private _value!: boolean;
+  private declare _value: boolean;
 
   constructor(defaults: BooleanExpressionProps);
   /** @hidden */

pkg/sass-parser/lib/src/expression/number.ts

@@ -54,7 +54,7 @@ export class NumberExpression extends Expression {
     // TODO - postcss/postcss#1957: Mark this as dirty
     this._value = value;
   }
-  private _value!: number;
+  private declare _value: number;
 
   /** The denominator units of this number. */
   get unit(): string | null {
@@ -64,7 +64,7 @@ export class NumberExpression extends Expression {
     // TODO - postcss/postcss#1957: Mark this as dirty
     this._unit = unit;
   }
-  private _unit!: string | null;
+  private declare _unit: string | null;
 
   /** Whether the number is unitless. */
   isUnitless(): boolean {

pkg/sass-parser/lib/src/expression/string.ts

@@ -55,7 +55,7 @@ export class StringExpression extends Expression {
     text.parent = this;
     this._text = text;
   }
-  private _text!: Interpolation;
+  private declare _text: Interpolation;
 
   // TODO: provide a utility asPlainIdentifier method that returns the value of
   // an identifier with any escapes resolved, if this is indeed a valid unquoted
@@ -75,7 +75,7 @@ export class StringExpression extends Expression {
     // TODO - postcss/postcss#1957: Mark this as dirty
     this._quotes = quotes;
   }
-  private _quotes!: boolean;
+  private declare _quotes: boolean;
 
   constructor(defaults: StringExpressionProps);
   /** @hidden */

pkg/sass-parser/lib/src/interpolation.ts

@@ -104,7 +104,7 @@ export class Interpolation
     // This *should* only ever be called by the superclass constructor.
     this._nodes = nodes;
   }
-  private _nodes?: Array<string | Expression>;
+  private declare _nodes?: Array<string | Expression>;
 
   /** Returns whether this contains no interpolated expressions. */
   get isPlain(): boolean {

pkg/sass-parser/lib/src/parameter-list.ts

@@ -97,7 +97,7 @@ export class ParameterList
     // This *should* only ever be called by the superclass constructor.
     this._nodes = nodes;
   }
-  private _nodes?: Array<Parameter>;
+  private declare _nodes?: Array<Parameter>;
 
   /**
    * The name of the rest parameter (such as `args` in `...$args`) in this

pkg/sass-parser/lib/src/statement/css-comment.ts

@@ -78,7 +78,7 @@ export class CssComment
     textInterpolation.parent = this;
     this._textInterpolation = textInterpolation;
   }
-  private _textInterpolation?: Interpolation;
+  private declare _textInterpolation?: Interpolation;
 
   constructor(defaults: CssCommentProps);
   /** @hidden */

pkg/sass-parser/lib/src/statement/debug-rule.ts

@@ -78,7 +78,7 @@ export class DebugRule
     if (debugExpression) debugExpression.parent = this;
     this._debugExpression = debugExpression;
   }
-  private _debugExpression?: Expression;
+  private declare _debugExpression?: Expression;
 
   constructor(defaults: DebugRuleProps);
   /** @hidden */

pkg/sass-parser/lib/src/statement/each-rule.ts

@@ -107,7 +107,7 @@ export class EachRule
     if (eachExpression) eachExpression.parent = this;
     this._eachExpression = eachExpression;
   }
-  private _eachExpression?: Expression;
+  private declare _eachExpression?: Expression;
 
   constructor(defaults: EachRuleProps);
   /** @hidden */