Parser

The parser instance, found in the compiler, is used to parse each module being processed by webpack. The parser is yet another webpack class that extends tapable and provides a variety of tapable hooks that can be used by plugin authors to customize the parsing process.

The parser is found within module factories and therefore takes little more work to access:

compiler.hooks.normalModuleFactory.tap('MyPlugin', factory => {
  factory.hooks.parser.for('javascript/auto').tap('MyPlugin', (parser, options) => {
    parser.hooks.someHook.tap(/* ... */);
  });
});

As with the compiler, tapAsync and tapPromise may also be available depending on the type of hook.

Hooks

The following lifecycle hooks are exposed by the parser and can be accessed as such:

evaluateTypeof

SyncBailHook

Evaluate the type of an identifier.

Parameters: expression

evaluate

SyncBailHook

Evaluate an expression.

Parameters: expression

evaluateIdentifier

SyncBailHook

Evaluate an identifier that is a free variable.

Parameters: expression

evaluateDefinedIdentifier

SyncBailHook

Evaluate an identifier that is a defined variable.

Parameters: expression

evaluateCallExpressionMember

SyncBailHook

Evaluate a call to a member function of a successfully evaluated expression.

Parameters: expression param

statement

SyncBailHook

General purpose hook that is called when parsing statements in a code fragment.

Parameters: statement

statementIf

SyncBailHook

...

Parameters: statement

label

SyncBailHook

...

Parameters: statement

import

SyncBailHook

...

Parameters: statement source

importSpecifier

SyncBailHook

...

Parameters: statement source exportName identifierName

export

SyncBailHook

...

Parameters: statement

exportImport

SyncBailHook

...

Parameters: statement source

exportDeclaration

SyncBailHook

...

Parameters: statement declaration

exportExpression

SyncBailHook

...

Parameters: statement declaration

exportSpecifier

SyncBailHook

...

Parameters: statement identifierName exportName index

exportImportSpecifier

SyncBailHook

...

Parameters: statement source identifierName exportName index

varDeclaration

SyncBailHook

...

Parameters: declaration

varDeclarationLet

SyncBailHook

...

Parameters: declaration

varDeclarationConst

SyncBailHook

...

Parameters: declaration

varDeclarationVar

SyncBailHook

...

Parameters: declaration

canRename

SyncBailHook

...

Parameters: initExpression

rename

SyncBailHook

...

Parameters: initExpression

assigned

SyncBailHook

...

Parameters: expression

assign

SyncBailHook

...

Parameters: expression

typeof

SyncBailHook

...

Parameters: expression

call

SyncBailHook

...

Parameters: expression

callAnyMember

SyncBailHook

...

Parameters: expression

new

SyncBailHook

...

Parameters: expression

expression

SyncBailHook

...

Parameters: expression

expressionAnyMember

SyncBailHook

...

Parameters: expression

expressionConditionalOperator

SyncBailHook

...

Parameters: expression

program

SyncBailHook

Get access to the abstract syntax tree (AST) of a code fragment

Parameters: ast comments