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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 | 11x 1x 11x 13x 1x 12x 12x 12x 13x 12x 14x 12x 8x 12x 6x 11x 53x 53x 44x 53x 48x 26x 22x 17x 17x 5x 53x 38x 38x 37x 15x 5x 5x 5x 3x 10x 1x 1x 1x 11x 24x 24x 24x 24x 20x 20x 11x 11x 11x 4x 1x 3x 3x 11x 37x 15x 15x 22x 20x 20x 11x 11x 15x 15x 22x 3x 12x 18x 6x 6x 11x 20x 20x 4x 4x 16x 16x 16x 46x 14x 16x 11x 20x 9x 11x 64x 56x 2x 4x 2x 11x 18x 11x 20x 4x 16x 4x 12x 1x 11x 11x | import { Visitor } from '@babel/traverse'; import * as t from '@babel/types'; type BabelTypes = typeof t; export default function (babelTypes: { types: BabelTypes }) { return { name: 'class-bound-components', visitor: makeRootVisitor(babelTypes.types), }; } type Options = { displayName?: boolean; elementType?: boolean; }; type State = { classBoundSpecifier: string | null; extendSpecifier: string | null; }; const reservedMethods = ['extend', 'withOptions', 'withVariants', 'as']; function makeRootVisitor(t: BabelTypes): Visitor { const importClassBoundVisitor: Visitor<{ opts: Options }> = { ImportDeclaration(path, state) { if (path.node.source.value !== 'class-bound-components') { return; } // Symbol of the classBound function const defaultImportLocal = path.node.specifiers.find( (s) => s.type === 'ImportDefaultSpecifier' )?.local.name; // Symbol of the standalone extend function const extendImportLocal = path.node.specifiers.find( (s) => s.type === 'ImportSpecifier' && s.imported.name === 'extend' )?.local.name; const traverseProgramWith = (visitor: Visitor<State>) => path.parentPath.traverse(visitor, { classBoundSpecifier: defaultImportLocal || null, extendSpecifier: extendImportLocal || null, }); if (state.opts.displayName ?? true) { traverseProgramWith(displayNameVisitor); } if (state.opts.elementType ?? true) { traverseProgramWith(elementTypeVisitor); } }, }; /** * Visits all `CallExpression`s and searches for calls of the `classBound` (or as whatever * symbol it is imported in the current module), `classBound.extend` or `extend` functions and tries * to explicitly add a `displayName` argument. The display name is taken from the corresponding * `VariableDeclaration` if possible. */ const displayNameVisitor: Visitor<State> = { CallExpression(path) { const { node: { callee }, } = path; const getImplicitDisplayName = (node: t.Node): string | null => { return node.type === 'VariableDeclarator' && node.id.type === 'Identifier' ? node.id.name : null; }; const isClassBoundCall = () => { if ( callee.type === 'Identifier' && callee.name === this.classBoundSpecifier ) { return true; } if ( callee.type === 'MemberExpression' && callee.object.type === 'Identifier' && callee.object.name === this.classBoundSpecifier ) { const propertyName = getStaticExpressionValue( callee.property as t.Expression ); return !!propertyName && reservedMethods.indexOf(propertyName) < 0; } return false; }; if (this.classBoundSpecifier && isClassBoundCall()) { const displayName = getImplicitDisplayName(path.parent); if (displayName) { addDisplayNameToClassBound(path.node, displayName); } } else if ( callee.type === 'MemberExpression' && callee.object.type === 'Identifier' && callee.object.name === this.classBoundSpecifier ) { const displayName = getImplicitDisplayName(path.parent); const propertyName = getStaticExpressionValue( callee.property as t.Expression ); if (propertyName === 'extend' && displayName) { addDisplayNameToExtend(path.node, displayName); } } else if ( this.extendSpecifier && callee.type === 'Identifier' && callee.name === this.extendSpecifier ) { const displayName = getImplicitDisplayName(path.parent); Eif (displayName) { addDisplayNameToExtend(path.node, displayName); } } }, }; /** * Visits all `CallExpression`s and searches for calls of the `classBound` function (or as whatever * symbol it is imported in the current module) and tries to replace a proxy member access of * `classBound[IntrinsicElement]()` with an explicit `elementType` argument. */ const elementTypeVisitor: Visitor<State> = { CallExpression(path) { const { node: { callee }, } = path; Eif ( this.classBoundSpecifier && callee.type === 'MemberExpression' && callee.object.type === 'Identifier' && callee.object.name === this.classBoundSpecifier ) { // Try to get the property name from Identifier, StringLiteral, TemplateLiteral etc. const propertyValue = getStaticExpressionValue( callee.property as t.Expression ); if (propertyValue && reservedMethods.indexOf(propertyValue) < 0) { inlineElementType(path.node, propertyValue); path.node.callee = t.identifier(this.classBoundSpecifier); } } }, }; const safeNonObjectTypes: Array<t.Expression['type']> = [ 'StringLiteral', 'TemplateLiteral', 'BinaryExpression', ]; const allowedFirstArgumentTypes: Array<t.Expression['type']> = [ ...safeNonObjectTypes, 'ArrayExpression', ]; const addDisplayNameToExtend = ( call: t.CallExpression, displayName: string ) => { // When there's more than 3 arguments, it has to be the full signature if (call.arguments.length > 3) { return; } Eif ( // Can safely add the third argument call.arguments.length < 3 || // Third argument has to be variants (call.arguments.length === 3 && call.arguments[2].type === 'ObjectExpression') ) { call.arguments.splice(2, 0, t.stringLiteral(displayName)); } }; /** * Given a `classBound` call expression, adds an explicit displayName argument if possible */ const addDisplayNameToClassBound = ( call: t.CallExpression, displayName: string | null ) => { if ( call.arguments.length === 1 && call.arguments[0].type === 'ObjectExpression' ) { transformOptionsSignature(call.arguments[0], displayName); return; } if ( call.arguments.length > 0 && (allowedFirstArgumentTypes as Array<string>).includes( call.arguments[0].type ) ) { transformPositionalSignatures(call, displayName); return; } }; const allowedObjectPropertyTypes: Array< t.ObjectExpression['properties'][0]['type'] > = ['ObjectMethod', 'ObjectProperty']; /** * Given an object expression representing a `classBound` options object, adds a `displayName` property. * `displayName` is only added when it's clear that it's not already present. E.g., when spreading another * object into the options object, we can't be sure a `displayName` is not already provided. */ const transformOptionsSignature = ( objectExpression: t.ObjectExpression, displayName: string | null ) => { Eif (displayName) { if ( !objectExpression.properties.every((p) => allowedObjectPropertyTypes.includes(p.type) ) ) { return; } const properties = objectExpression.properties as Array< t.ObjectMethod | t.ObjectProperty >; if (properties.some((p) => isStaticObjectKey(p.key, 'displayName'))) { return; } objectExpression.properties.push( t.objectProperty( t.identifier('displayName'), t.stringLiteral(displayName) ) ); } }; /** * Given a CallExpression of `classBound[JSX.IntrinsicElement]()` tries to move the proxy method. * Returns a boolean indicating whether it was successfully added. */ const inlineElementType = (call: t.CallExpression, elementType: string) => { const [optionsOrClassName] = call.arguments; if ( call.arguments.length === 1 && optionsOrClassName.type === 'ObjectExpression' ) { optionsOrClassName.properties.push( t.objectProperty( t.identifier('elementType'), t.stringLiteral(elementType) ) ); return; } // When the second argument is an ObjectExpression it has to be [className, variants, elementType] const isShortSignature = call.arguments.length === 2 && call.arguments[1].type === 'ObjectExpression'; // When it's not for sure the short signature it has to be [className, displayName, variants, elementType], // otherwise elementType can always be passed as the fourth argument const elementTypePosition = isShortSignature ? 2 : 3; // Fill with null literals for (let i = 0; i < elementTypePosition; ++i) { if (!call.arguments[i]) { call.arguments[i] = t.nullLiteral(); } } call.arguments[elementTypePosition] = t.stringLiteral(elementType); }; const transformPositionalSignatures = ( call: t.CallExpression, displayName: string | null ) => { if (displayName && shouldInsertDisplayNameIntoPositionalSignature(call)) { call.arguments.splice(1, 0, t.stringLiteral(displayName)); } }; /** * Given an arbitrary expression, tries to retrieve its static value, e.g., * for Identifiers, StringLiterals or TemplateLiterals with only static parts */ const getStaticExpressionValue = (expression: t.Expression) => { switch (expression.type) { case 'Identifier': return expression.name; case 'StringLiteral': return expression.value; case 'TemplateLiteral': return expression.quasis.length === 1 ? expression.quasis[0].value.raw : null; default: return null; } }; const isStaticObjectKey = (key: t.Expression, name: string) => getStaticExpressionValue(key) === name; /** * Given a `CallExpression` of the `classBound` function, tries to infer the signature used by the nature * of the arguments and decides whether it is safe to insert an explicit `displayName` as the second argument. * It is considered safe when it is clear that no explicit `displayName` is given in the input. * * @param call Call to check for arguments * @returns Whether to insert an explicit `displayName` */ const shouldInsertDisplayNameIntoPositionalSignature = ( call: t.CallExpression ) => { // When there's only the className argument there cannot be a displayName if (call.arguments.length === 1) { return true; } // When there are multiple arguments we can be sure that the second is variants // when it's an object expression, so `displayName` can be added before it if ( call.arguments.length > 1 && call.arguments[1].type === 'ObjectExpression' ) { return true; } // When there are three arguments and the (className, variants, elementType) signature couldn't be // inferred from `variants` being an ObjectExpression, we can still be sure we have it when the last // one is a string (i.e. `elementType` is an intrinsic JSX element) if ( call.arguments.length === 3 && safeNonObjectTypes.includes( call.arguments[2].type as t.Expression['type'] ) ) { return true; } return false; }; return importClassBoundVisitor as Visitor<any>; } |