fuse-box
Version:
Fuse-Box a bundler that does it right
75 lines (74 loc) • 2.52 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.BuildEnvTransformer = exports.BUILD_ENV_NAME = void 0;
const AST_1 = require("../../interfaces/AST");
const parser_1 = require("../../parser");
exports.BUILD_ENV_NAME = '__build_env';
const CACHE_AST = {};
function getEnvAST(obj) {
let str;
if (typeof obj === 'string')
str = obj;
else
str = JSON.stringify(obj);
if (CACHE_AST[str])
return CACHE_AST[str];
let ast;
if (typeof obj === 'object') {
ast = parser_1.parseJavascript('var a = ' + str);
}
else {
try {
ast = parser_1.parseJavascript(str);
}
catch (e) {
throw new Error(`Error while parsing string : "${str}".
Make sure you're passing a valid javascript string.
Otherwise pass a javascript object (it will be converting to AST automatically)
`);
}
}
const body = ast.body;
const firstItem = body[0];
if (firstItem) {
let expression;
switch (firstItem.type) {
case AST_1.ASTType.ExpressionStatement:
expression = firstItem.expression;
break;
case AST_1.ASTType.VariableDeclaration:
expression = firstItem.declarations[0].init;
break;
default:
break;
}
if (expression)
CACHE_AST[str] = expression;
return expression;
}
return CACHE_AST[str];
}
function BuildEnvTransformer() {
return {
commonVisitors: props => {
const compilerOptions = props.transformationContext.compilerOptions;
const buildEnv = compilerOptions.buildEnv;
return {
onEach: (schema) => {
const { node } = schema;
if (node.type === AST_1.ASTType.MemberExpression && node.object.name === exports.BUILD_ENV_NAME) {
const propertyName = node.property.name;
if (buildEnv[propertyName] !== undefined) {
const ast = getEnvAST(buildEnv[propertyName]);
if (ast)
return schema.replace(ast);
}
return schema.replace({ name: 'undefined', type: AST_1.ASTType.Identifier });
}
return;
},
};
},
};
}
exports.BuildEnvTransformer = BuildEnvTransformer;