/
UpdateExpression.ts
78 lines (73 loc) · 2.26 KB
/
UpdateExpression.ts
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import MagicString from 'magic-string';
import { RenderOptions } from '../../utils/renderHelpers';
import {
renderSystemExportExpression,
renderSystemExportSequenceAfterExpression,
renderSystemExportSequenceBeforeExpression
} from '../../utils/systemJsRendering';
import { HasEffectsContext } from '../ExecutionContext';
import { EMPTY_PATH, ObjectPath } from '../utils/PathTracker';
import Identifier from './Identifier';
import * as NodeType from './NodeType';
import { ExpressionNode, NodeBase } from './shared/Node';
export default class UpdateExpression extends NodeBase {
argument!: ExpressionNode;
operator!: '++' | '--';
prefix!: boolean;
type!: NodeType.tUpdateExpression;
protected deoptimized = false;
hasEffects(context: HasEffectsContext): boolean {
if (!this.deoptimized) this.applyDeoptimizations();
return (
this.argument.hasEffects(context) ||
this.argument.hasEffectsWhenAssignedAtPath(EMPTY_PATH, context)
);
}
hasEffectsWhenAccessedAtPath(path: ObjectPath): boolean {
return path.length > 1;
}
render(code: MagicString, options: RenderOptions): void {
this.argument.render(code, options);
if (options.format === 'system') {
const variable = this.argument.variable!;
const exportNames = options.exportNamesByVariable.get(variable);
if (exportNames) {
const _ = options.compact ? '' : ' ';
if (this.prefix) {
if (exportNames.length === 1) {
renderSystemExportExpression(variable, this.start, this.end, code, options);
} else {
renderSystemExportSequenceAfterExpression(
variable,
this.start,
this.end,
this.parent.type !== NodeType.ExpressionStatement,
code,
options
);
}
} else {
const operator = this.operator[0];
renderSystemExportSequenceBeforeExpression(
variable,
this.start,
this.end,
this.parent.type !== NodeType.ExpressionStatement,
code,
options,
`${_}${operator}${_}1`
);
}
}
}
}
protected applyDeoptimizations(): void {
this.deoptimized = true;
this.argument.deoptimizePath(EMPTY_PATH);
if (this.argument instanceof Identifier) {
const variable = this.scope.findVariable(this.argument.name);
variable.isReassigned = true;
}
this.context.requestTreeshakingPass();
}
}