Unable to re-assign variable in webpack plugin using parser hook
I'm trying to re-assign a variable in a specific file dynamically based on passed in build arguments but I'm having trouble understanding the plugin documentation and figuring out where the place for me to wire this in would be.
The ideal scenario would be to be able to pass a file name, variable name, and variable value to the plugin (for brevity I've left out the constructor to take in these arguments), and then override/re-assign them in the given file.
I.e. Index.ts would have let myVariable = false;, and I'd like to flip this to true based on passed in parameters to webpack.
With the below code, I can use the parser to find the variable, but I can't seem to change it. I've tried statement.declarations[0].init.raw = "true" and statement.declarations[0].init.value = true, but the output index.js file still has the original false value.
Am I trying to do this in the wrong part of the webpack process, or do I need to be using a different hook? Any guidance on how or where I could do this would be really helpful. Thanks.
class MyPlugin {
apply(compiler) {
compiler.hooks.beforeCompile.
tap('MyPlugin', ({ normalModuleFactory }) => {
normalModuleFactory.hooks.parser.
for("javascript/auto").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/dynamic").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/esm").
tap("MyPlugin", handler);
});
function handler(parser, options) {
parser.hooks.statement.tap('MyPlugin', (statement) => {
const module = parser.state.module;
if (module.resource
&& module.resource.endsWith('index.ts')
&& statement.type === 'VariableDeclaration'
&& statement.declarations[0].id.name === 'myVariable') {
// Do something here??
}
});
}
}
}
module.exports = MyPlugin;
webpack-4 webpack-plugin
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
add a comment |
I'm trying to re-assign a variable in a specific file dynamically based on passed in build arguments but I'm having trouble understanding the plugin documentation and figuring out where the place for me to wire this in would be.
The ideal scenario would be to be able to pass a file name, variable name, and variable value to the plugin (for brevity I've left out the constructor to take in these arguments), and then override/re-assign them in the given file.
I.e. Index.ts would have let myVariable = false;, and I'd like to flip this to true based on passed in parameters to webpack.
With the below code, I can use the parser to find the variable, but I can't seem to change it. I've tried statement.declarations[0].init.raw = "true" and statement.declarations[0].init.value = true, but the output index.js file still has the original false value.
Am I trying to do this in the wrong part of the webpack process, or do I need to be using a different hook? Any guidance on how or where I could do this would be really helpful. Thanks.
class MyPlugin {
apply(compiler) {
compiler.hooks.beforeCompile.
tap('MyPlugin', ({ normalModuleFactory }) => {
normalModuleFactory.hooks.parser.
for("javascript/auto").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/dynamic").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/esm").
tap("MyPlugin", handler);
});
function handler(parser, options) {
parser.hooks.statement.tap('MyPlugin', (statement) => {
const module = parser.state.module;
if (module.resource
&& module.resource.endsWith('index.ts')
&& statement.type === 'VariableDeclaration'
&& statement.declarations[0].id.name === 'myVariable') {
// Do something here??
}
});
}
}
}
module.exports = MyPlugin;
webpack-4 webpack-plugin
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
add a comment |
I'm trying to re-assign a variable in a specific file dynamically based on passed in build arguments but I'm having trouble understanding the plugin documentation and figuring out where the place for me to wire this in would be.
The ideal scenario would be to be able to pass a file name, variable name, and variable value to the plugin (for brevity I've left out the constructor to take in these arguments), and then override/re-assign them in the given file.
I.e. Index.ts would have let myVariable = false;, and I'd like to flip this to true based on passed in parameters to webpack.
With the below code, I can use the parser to find the variable, but I can't seem to change it. I've tried statement.declarations[0].init.raw = "true" and statement.declarations[0].init.value = true, but the output index.js file still has the original false value.
Am I trying to do this in the wrong part of the webpack process, or do I need to be using a different hook? Any guidance on how or where I could do this would be really helpful. Thanks.
class MyPlugin {
apply(compiler) {
compiler.hooks.beforeCompile.
tap('MyPlugin', ({ normalModuleFactory }) => {
normalModuleFactory.hooks.parser.
for("javascript/auto").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/dynamic").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/esm").
tap("MyPlugin", handler);
});
function handler(parser, options) {
parser.hooks.statement.tap('MyPlugin', (statement) => {
const module = parser.state.module;
if (module.resource
&& module.resource.endsWith('index.ts')
&& statement.type === 'VariableDeclaration'
&& statement.declarations[0].id.name === 'myVariable') {
// Do something here??
}
});
}
}
}
module.exports = MyPlugin;
webpack-4 webpack-plugin
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
I'm trying to re-assign a variable in a specific file dynamically based on passed in build arguments but I'm having trouble understanding the plugin documentation and figuring out where the place for me to wire this in would be.
The ideal scenario would be to be able to pass a file name, variable name, and variable value to the plugin (for brevity I've left out the constructor to take in these arguments), and then override/re-assign them in the given file.
I.e. Index.ts would have let myVariable = false;, and I'd like to flip this to true based on passed in parameters to webpack.
With the below code, I can use the parser to find the variable, but I can't seem to change it. I've tried statement.declarations[0].init.raw = "true" and statement.declarations[0].init.value = true, but the output index.js file still has the original false value.
Am I trying to do this in the wrong part of the webpack process, or do I need to be using a different hook? Any guidance on how or where I could do this would be really helpful. Thanks.
class MyPlugin {
apply(compiler) {
compiler.hooks.beforeCompile.
tap('MyPlugin', ({ normalModuleFactory }) => {
normalModuleFactory.hooks.parser.
for("javascript/auto").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/dynamic").
tap("MyPlugin", handler);
normalModuleFactory.hooks.parser.
for("javascript/esm").
tap("MyPlugin", handler);
});
function handler(parser, options) {
parser.hooks.statement.tap('MyPlugin', (statement) => {
const module = parser.state.module;
if (module.resource
&& module.resource.endsWith('index.ts')
&& statement.type === 'VariableDeclaration'
&& statement.declarations[0].id.name === 'myVariable') {
// Do something here??
}
});
}
}
}
module.exports = MyPlugin;
webpack-4 webpack-plugin
webpack-4 webpack-plugin
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
asked Nov 13 '18 at 0:19
TekGiantTekGiant
4192623
4192623
add a comment |
add a comment |
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