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@babel/helper-member-expression-to-functions
Advanced tools
Helper function to replace certain member expressions with function calls
The @babel/helper-member-expression-to-functions package is a Babel helper that transforms member expressions to functions. It is used internally by Babel plugins to handle transformations of member expressions in a consistent way, especially when dealing with computed properties and ensuring that the base object is only evaluated once.
Transforming member expressions into function calls
This feature allows Babel plugins to transform member expressions like `object.property` or `object['property']` into function calls that can handle the logic for computed properties and ensure the base object is evaluated once. This is particularly useful when compiling ES6 code to ES5.
memberExpressionToFunctions(path, visitor, state)
This package is similar in that it is also a Babel helper used to transform functions. It helps with the naming of anonymous function expressions. While it does not directly transform member expressions, it is used in the process of transforming and naming functions within Babel plugins.
This Babel helper is used to transform super calls in methods. It is similar to @babel/helper-member-expression-to-functions in that it deals with transforming parts of the language that involve property access, but it specifically targets super property calls.
This helper is used to optimize call expressions within Babel plugins. It is similar in the sense that it transforms call expressions, which can sometimes be the result of transforming member expressions with @babel/helper-member-expression-to-functions.
Helper function to replace certain member expressions with function calls
Designed for internal Babel use.
Traverses the path
using the supplied visitor
and an augmented state
.
const visitor = {
MemberExpression(memberPath, state) {
if (someCondition(memberPath)) {
// The handle method is supplied by memberExpressionToFunctions.
// It should be called whenever a MemberExpression should be
// converted into the proper function calls.
state.handle(memberPath);
}
},
};
// The helper requires three special methods on state: `get`, `set`, and
// `call`.
// Optionally, a special `memoise` method may be defined, which gets
// called if the member is in a self-referential update expression.
// Everything else will be passed through as normal.
const state = {
get(memberPath) {
// Return some AST that will get the member
return t.callExpression(
this.file.addHelper('superGet'),
[t.thisExpression(), memberPath.node.property]
);
},
set(memberPath, value) {
// Return some AST that will set the member
return t.callExpression(
this.file.addHelper('superSet'),
[t.thisExpression(), memberPath.node.property, value]
);
},
call(memberPath, args) {
// Return some AST that will call the member with the proper context
// and args
return t.callExpression(
t.memberExpression(this.get(memberPath), t.identifier("apply")),
[t.thisExpression(), t.arrayExpression(args)]
);
},
memoise(memberPath) {
const { node } = memberPath;
if (node.computed) {
MEMOISED.set(node, ...);
}
},
// The handle method is provided by memberExpressionToFunctions.
// handle(memberPath) { ... }
// Other state stuff is left untouched.
someState: new Set(),
};
// Replace all the special MemberExpressions in rootPath, as determined
// by our visitor, using the state methods.
memberExpressionToFunctions(rootPath, visitor, state);
FAQs
Helper function to replace certain member expressions with function calls
The npm package @babel/helper-member-expression-to-functions receives a total of 17,465,857 weekly downloads. As such, @babel/helper-member-expression-to-functions popularity was classified as popular.
We found that @babel/helper-member-expression-to-functions demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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