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Function arrowFunctionToExpression has a Cognitive Complexity of 11 (exceeds 5 allowed). Consider refactoring.
Open

export function arrowFunctionToExpression({
  allowInsertArrow = true,
  specCompliant = false,
} = {}) {
  if (!this.isArrowFunctionExpression()) {
Severity: Minor
Found in packages/babel-traverse/src/path/conversion.js - About 1 hr to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Function findRelativeConfig has a Cognitive Complexity of 11 (exceeds 5 allowed). Consider refactoring.
Open

export function* findRelativeConfig(
  packageData: FilePackageData,
  envName: string,
  caller: CallerMetadata | void,
): Handler<RelativeConfig> {
Severity: Minor
Found in packages/babel-core/src/config/files/configuration.js - About 1 hr to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Function referencesImport has a Cognitive Complexity of 11 (exceeds 5 allowed). Consider refactoring.
Open

export function referencesImport(moduleSource, importName) {
  if (!this.isReferencedIdentifier()) return false;

  const binding = this.scope.getBinding(this.node.name);
  if (!binding || binding.kind !== "module") return false;
Severity: Minor
Found in packages/babel-traverse/src/path/introspection.js - About 1 hr to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Function _isBaseType has a Cognitive Complexity of 11 (exceeds 5 allowed). Consider refactoring.
Open

function _isBaseType(baseName: string, type?, soft?): boolean {
  if (baseName === "string") {
    return t.isStringTypeAnnotation(type);
  } else if (baseName === "number") {
    return t.isNumberTypeAnnotation(type);
Severity: Minor
Found in packages/babel-traverse/src/path/inference/index.js - About 1 hr to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Similar blocks of code found in 4 locations. Consider refactoring.
Open

defineType("WithStatement", {
  visitor: ["object", "body"],
  aliases: ["Statement"],
  fields: {
    object: {
Severity: Major
Found in packages/babel-types/src/definitions/core.js and 3 other locations - About 1 hr to fix
packages/babel-types/src/definitions/core.js on lines 547..558
packages/babel-types/src/definitions/es2015.js on lines 357..368
packages/babel-types/src/definitions/jsx.js on lines 122..133

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 4 locations. Consider refactoring.
Open

defineType("LabeledStatement", {
  visitor: ["label", "body"],
  aliases: ["Statement"],
  fields: {
    label: {
Severity: Major
Found in packages/babel-types/src/definitions/core.js and 3 other locations - About 1 hr to fix
packages/babel-types/src/definitions/core.js on lines 1139..1150
packages/babel-types/src/definitions/es2015.js on lines 357..368
packages/babel-types/src/definitions/jsx.js on lines 122..133

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 4 locations. Consider refactoring.
Open

defineType("JSXNamespacedName", {
  visitor: ["namespace", "name"],
  aliases: ["JSX"],
  fields: {
    namespace: {
Severity: Major
Found in packages/babel-types/src/definitions/jsx.js and 3 other locations - About 1 hr to fix
packages/babel-types/src/definitions/core.js on lines 547..558
packages/babel-types/src/definitions/core.js on lines 1139..1150
packages/babel-types/src/definitions/es2015.js on lines 357..368

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

  if (Array.isArray(value)) {
    value.forEach((item, i) => {
      if (!checkValidTest(item)) {
        throw new Error(
          `${msg(access(loc, i))} must be a string/Function/RegExp.`,
Severity: Major
Found in packages/babel-core/src/config/validation/option-assertions.js and 1 other location - About 1 hr to fix
packages/babel-core/src/config/validation/option-assertions.js on lines 246..258

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 4 locations. Consider refactoring.
Open

defineType("ExportSpecifier", {
  visitor: ["local", "exported"],
  aliases: ["ModuleSpecifier"],
  fields: {
    local: {
Severity: Major
Found in packages/babel-types/src/definitions/es2015.js and 3 other locations - About 1 hr to fix
packages/babel-types/src/definitions/core.js on lines 547..558
packages/babel-types/src/definitions/core.js on lines 1139..1150
packages/babel-types/src/definitions/jsx.js on lines 122..133

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Identical blocks of code found in 2 locations. Consider refactoring.
Open

  if (Array.isArray(value)) {
    value.forEach((item, i) => {
      if (!checkValidTest(item)) {
        throw new Error(
          `${msg(access(loc, i))} must be a string/Function/RegExp.`,
Severity: Major
Found in packages/babel-core/src/config/validation/option-assertions.js and 1 other location - About 1 hr to fix
packages/babel-core/src/config/validation/option-assertions.js on lines 294..307

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

    try {
      options = JSON.parse(content);
    } catch (err) {
      err.message = `${filepath}: Error while parsing JSON - ${err.message}`;
      throw err;
Severity: Major
Found in packages/babel-core/src/config/files/package.js and 1 other location - About 1 hr to fix
packages/babel-core/src/config/files/configuration.js on lines 257..262

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

  const {
    placeholderWhitelist = a.placeholderWhitelist,
    placeholderPattern = a.placeholderPattern,
    preserveComments = a.preserveComments,
    syntacticPlaceholders = a.syntacticPlaceholders,
Severity: Major
Found in packages/babel-template/src/options.js and 1 other location - About 1 hr to fix
packages/babel-helper-builder-react-jsx-experimental/src/index.js on lines 26..31

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

const validateBabelrcFile = makeWeakCacheSync(
  (file: ConfigFile): ValidatedFile => ({
    filepath: file.filepath,
    dirname: file.dirname,
    options: validate("babelrcfile", file.options),
Severity: Major
Found in packages/babel-core/src/config/config-chain.js and 1 other location - About 1 hr to fix
packages/babel-core/src/config/config-chain.js on lines 280..286

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

  try {
    options = json5.parse(content);
  } catch (err) {
    err.message = `${filepath}: Error while parsing config - ${err.message}`;
    throw err;
Severity: Major
Found in packages/babel-core/src/config/files/configuration.js and 1 other location - About 1 hr to fix
packages/babel-core/src/config/files/package.js on lines 41..46

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

const validateConfigFile = makeWeakCacheSync(
  (file: ConfigFile): ValidatedFile => ({
    filepath: file.filepath,
    dirname: file.dirname,
    options: validate("configfile", file.options),
Severity: Major
Found in packages/babel-core/src/config/config-chain.js and 1 other location - About 1 hr to fix
packages/babel-core/src/config/config-chain.js on lines 288..294

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

  const {
    importSource: IMPORT_SOURCE_DEFAULT = DEFAULT.importSource,
    runtime: RUNTIME_DEFAULT = DEFAULT.runtime,
    pragma: PRAGMA_DEFAULT = DEFAULT.pragma,
    pragmaFrag: PRAGMA_FRAG_DEFAULT = DEFAULT.pragmaFrag,
Severity: Major
Found in packages/babel-helper-builder-react-jsx-experimental/src/index.js and 1 other location - About 1 hr to fix
packages/babel-template/src/options.js on lines 57..62

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 60.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Function targetsSupported has 31 lines of code (exceeds 25 allowed). Consider refactoring.
Open

export function targetsSupported(target: Targets, support: Targets) {
  const targetEnvironments = Object.keys(target);

  if (targetEnvironments.length === 0) {
    return false;
Severity: Minor
Found in packages/babel-helper-compilation-targets/src/filter-items.js - About 1 hr to fix

    Function transpileNamespace has 31 lines of code (exceeds 25 allowed). Consider refactoring.
    Open

    export default function transpileNamespace(path, t, allowNamespaces) {
  if (path.node.declare || path.node.id.type === "StringLiteral") {
    path.remove();
    return;
  }
    Severity: Minor
    Found in packages/babel-plugin-transform-typescript/src/namespace.js - About 1 hr to fix

      Function field has 31 lines of code (exceeds 25 allowed). Consider refactoring.
      Open

            field(path) {
        const { node } = path;

        if (!allowDeclareFields && node.declare) {
          throw path.buildCodeFrameError(
      Severity: Minor
      Found in packages/babel-plugin-transform-typescript/src/index.js - About 1 hr to fix

        Function tsSkipParameterStart has 31 lines of code (exceeds 25 allowed). Consider refactoring.
        Open

            tsSkipParameterStart(): boolean {
      if (this.match(tt.name) || this.match(tt._this)) {
        this.next();
        return true;
      }
        Severity: Minor
        Found in packages/babel-parser/src/plugins/typescript/index.js - About 1 hr to fix
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