/
tsconfig_json.go
252 lines (225 loc) · 7.54 KB
/
tsconfig_json.go
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package resolver
import (
"fmt"
"strings"
"github.com/evanw/esbuild/internal/cache"
"github.com/evanw/esbuild/internal/js_ast"
"github.com/evanw/esbuild/internal/js_lexer"
"github.com/evanw/esbuild/internal/js_parser"
"github.com/evanw/esbuild/internal/logger"
)
type TSConfigJSON struct {
// The absolute path of "compilerOptions.baseUrl"
BaseURL *string
// This is used if "Paths" is non-nil. It's equal to "BaseURL" except if
// "BaseURL" is missing, in which case it is as if "BaseURL" was ".". This
// is to implement the "paths without baseUrl" feature from TypeScript 4.1.
// More info: https://github.com/microsoft/TypeScript/issues/31869
BaseURLForPaths string
// The verbatim values of "compilerOptions.paths". The keys are patterns to
// match and the values are arrays of fallback paths to search. Each key and
// each fallback path can optionally have a single "*" wildcard character.
// If both the key and the value have a wildcard, the substring matched by
// the wildcard is substituted into the fallback path. The keys represent
// module-style path names and the fallback paths are relative to the
// "baseUrl" value in the "tsconfig.json" file.
Paths map[string][]string
JSXFactory []string
JSXFragmentFactory []string
UseDefineForClassFields bool
PreserveImportsNotUsedAsValues bool
}
func ParseTSConfigJSON(
log logger.Log,
source logger.Source,
jsonCache *cache.JSONCache,
extends func(string, logger.Range) *TSConfigJSON,
) *TSConfigJSON {
// Unfortunately "tsconfig.json" isn't actually JSON. It's some other
// format that appears to be defined by the implementation details of the
// TypeScript compiler.
//
// Attempt to parse it anyway by modifying the JSON parser, but just for
// these particular files. This is likely not a completely accurate
// emulation of what the TypeScript compiler does (e.g. string escape
// behavior may also be different).
json, ok := jsonCache.Parse(log, source, js_parser.JSONOptions{
AllowComments: true, // https://github.com/microsoft/TypeScript/issues/4987
AllowTrailingCommas: true,
})
if !ok {
return nil
}
var result TSConfigJSON
// Parse "extends"
if extends != nil {
if valueJSON, _, ok := getProperty(json, "extends"); ok {
if value, ok := getString(valueJSON); ok {
if base := extends(value, source.RangeOfString(valueJSON.Loc)); base != nil {
result = *base
}
}
}
}
// Parse "compilerOptions"
if compilerOptionsJSON, _, ok := getProperty(json, "compilerOptions"); ok {
// Parse "baseUrl"
if valueJSON, _, ok := getProperty(compilerOptionsJSON, "baseUrl"); ok {
if value, ok := getString(valueJSON); ok {
result.BaseURL = &value
}
}
// Parse "jsxFactory"
if valueJSON, _, ok := getProperty(compilerOptionsJSON, "jsxFactory"); ok {
if value, ok := getString(valueJSON); ok {
result.JSXFactory = parseMemberExpressionForJSX(log, source, valueJSON.Loc, value)
}
}
// Parse "jsxFragmentFactory"
if valueJSON, _, ok := getProperty(compilerOptionsJSON, "jsxFragmentFactory"); ok {
if value, ok := getString(valueJSON); ok {
result.JSXFragmentFactory = parseMemberExpressionForJSX(log, source, valueJSON.Loc, value)
}
}
// Parse "useDefineForClassFields"
if valueJSON, _, ok := getProperty(compilerOptionsJSON, "useDefineForClassFields"); ok {
if value, ok := getBool(valueJSON); ok {
result.UseDefineForClassFields = value
}
}
// Parse "importsNotUsedAsValues"
if valueJSON, _, ok := getProperty(compilerOptionsJSON, "importsNotUsedAsValues"); ok {
if value, ok := getString(valueJSON); ok {
switch value {
case "preserve", "error":
result.PreserveImportsNotUsedAsValues = true
case "remove":
default:
log.AddRangeWarning(&source, source.RangeOfString(valueJSON.Loc),
fmt.Sprintf("Invalid value %q for \"importsNotUsedAsValues\"", value))
}
}
}
// Parse "paths"
if valueJSON, _, ok := getProperty(compilerOptionsJSON, "paths"); ok {
if paths, ok := valueJSON.Data.(*js_ast.EObject); ok {
hasBaseURL := result.BaseURL != nil
if hasBaseURL {
result.BaseURLForPaths = *result.BaseURL
} else {
result.BaseURLForPaths = "."
}
result.Paths = make(map[string][]string)
for _, prop := range paths.Properties {
if key, ok := getString(prop.Key); ok {
if !isValidTSConfigPathPattern(key, log, source, prop.Key.Loc) {
continue
}
// The "paths" field is an object which maps a pattern to an
// array of remapping patterns to try, in priority order. See
// the documentation for examples of how this is used:
// https://www.typescriptlang.org/docs/handbook/module-resolution.html#path-mapping.
//
// One particular example:
//
// {
// "compilerOptions": {
// "baseUrl": "projectRoot",
// "paths": {
// "*": [
// "*",
// "generated/*"
// ]
// }
// }
// }
//
// Matching "folder1/file2" should first check "projectRoot/folder1/file2"
// and then, if that didn't work, also check "projectRoot/generated/folder1/file2".
if array, ok := prop.Value.Data.(*js_ast.EArray); ok {
for _, item := range array.Items {
if str, ok := getString(item); ok {
if isValidTSConfigPathPattern(str, log, source, item.Loc) &&
(hasBaseURL || isValidTSConfigPathNoBaseURLPattern(str, log, source, item.Loc)) {
result.Paths[key] = append(result.Paths[key], str)
}
}
}
} else {
log.AddRangeWarning(&source, source.RangeOfString(prop.Value.Loc), fmt.Sprintf(
"Substitutions for pattern %q should be an array", key))
}
}
}
}
}
}
return &result
}
func parseMemberExpressionForJSX(log logger.Log, source logger.Source, loc logger.Loc, text string) []string {
if text == "" {
return nil
}
parts := strings.Split(text, ".")
for _, part := range parts {
if !js_lexer.IsIdentifier(part) {
warnRange := source.RangeOfString(loc)
log.AddRangeWarning(&source, warnRange, fmt.Sprintf("Invalid JSX member expression: %q", text))
return nil
}
}
return parts
}
func isValidTSConfigPathPattern(text string, log logger.Log, source logger.Source, loc logger.Loc) bool {
foundAsterisk := false
for i := 0; i < len(text); i++ {
if text[i] == '*' {
if foundAsterisk {
r := source.RangeOfString(loc)
log.AddRangeWarning(&source, r, fmt.Sprintf(
"Invalid pattern %q, must have at most one \"*\" character", text))
return false
}
foundAsterisk = true
}
}
return true
}
func isSlash(c byte) bool {
return c == '/' || c == '\\'
}
func isValidTSConfigPathNoBaseURLPattern(text string, log logger.Log, source logger.Source, loc logger.Loc) bool {
var c0 byte
var c1 byte
var c2 byte
n := len(text)
if n > 0 {
c0 = text[0]
if n > 1 {
c1 = text[1]
if n > 2 {
c2 = text[2]
}
}
}
// Relative "." or ".."
if c0 == '.' && (n == 1 || (n == 2 && c1 == '.')) {
return true
}
// Relative "./" or "../" or ".\\" or "..\\"
if c0 == '.' && (isSlash(c1) || (c1 == '.' && isSlash(c2))) {
return true
}
// Absolute POSIX "/" or UNC "\\"
if isSlash(c0) {
return true
}
// Absolute DOS "c:/" or "c:\\"
if ((c0 >= 'a' && c0 <= 'z') || (c0 >= 'A' && c0 <= 'Z')) && c1 == ':' && isSlash(c2) {
return true
}
r := source.RangeOfString(loc)
log.AddRangeWarning(&source, r, fmt.Sprintf(
"Non-relative path %q is not allowed when \"baseUrl\" is not set (did you forget a leading \"./\"?)", text))
return false
}