[ Web Proxy ]
URL:
Viewing: https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Errors/Cant_delete [Back]  [Original]
TypeError: property "x" is non-configurable and can't be deleted - JavaScript | MDN
HTML

HTML: Markup language

HTML reference
HTML guides
Markup languages
CSS

CSS: Styling language

CSS reference
CSS guides
Layout cookbook
JavaScriptJS

JavaScript: Scripting language

JS reference
JS guides
Web APIs

Web APIs: Programming interfaces

Web API reference
Web API guides
All

All web technology

Technologies
Topics
Learn

Learn web development

Frontend developer course
Learn HTML
Learn CSS
Learn JavaScript
Tools

Discover our tools

About

Get to know MDN better

Blog
Basculer la barre latrale
  1. Web
  2. JavaScript
  3. Rfrence
  4. Rfrence des erreurs JavaScript
  5. TypeError: property "x" is non-configurable and can't be deleted
Thme
  • Automatique
  • Clair
  • Sombre
Franais
Se souvenir de la langue En savoir plus

Cette page a t traduite partir de l'anglais par la communaut. Vous pouvez contribuer en rejoignant la communaut francophone sur MDN Web Docs.

View in English Always switch to English

TypeError: property "x" is non-configurable and can't be deleted

Message

TypeError: Calling delete on 'x' is not allowed in strict mode (Edge)
TypeError: property "x" is non-configurable and can't be deleted. (Firefox)
TypeError: Cannot delete property 'x' of #<Object> (Chrome)

Dans cet article

Type d'erreur

TypeError in strict mode only.

Quel est le problme ?

Une instruction demande la suppression d'une proprit non-configurable. L'attribut configurable permet de contrler si la proprit peut tre supprime de l'objet auquel elle est rattache et si ces attributs (en dehors de writable) peuvent tre modifis.

Cette erreur ne se produit qu'en mode strict. En mode non-strict, l'opration de suppression renverra false.

Exemples

Les proprits non-configurables ne sont pas trs frquentes mais il est possible d'en crer grce Object.defineProperty() ou Object.freeze().

js
"use strict";
var obj = Object.freeze({ name: "Elsa", score: 157 });
delete obj.score; // TypeError

("use strict");
var obj = {};
Object.defineProperty(obj, "toto", { value: 2, configurable: false });
delete obj.toto; // TypeError

("use strict");
var frozenArray = Object.freeze([0, 1, 2]);
frozenArray.pop(); // TypeError

Certaines proprits natives de JavaScript sont non-configurables. Peut-tre que le code tente de supprimer une constante mathmatique :

js
"use strict";
delete Math.PI; // TypeError

Voir aussi

Aider amliorer MDN

Cette page vous a-t-elle t utile ?
Oui Non
Apprendre contribuer

Cette page a t modifie le 7 sept. 2025 par les contributeurices du MDN.

Voir cette page sur GitHub Signaler un problme avec ce contenu
Effacer le filtre
  1. JavaScript
  2. Tutoriels et guides
  3. Guide JavaScript
    1. Introduction
    2. Types et grammaire
    3. Contrle du flux et gestion des erreurs
    4. Boucles et itration
    5. Fonctions
    6. Expressions et oprateurs
    7. Nombres et chanes de caractres
    8. Reprsentation des dates et heures
    9. Expressions rationnelles
    10. Collections indexes
    11. Collections avec cls
    12. Manipuler les objets
    13. Utiliser les classes
    14. Utiliser les promesses
    15. Tableaux typs en JavaScript
    16. Itrateurs et gnrateurs
    17. Gestion des ressources
    18. Internationalisation
    19. Modules JavaScript
  4. Intermdiaire
    1. Aperu du langage
    2. Structures de donnes en JavaScript
    3. Diffrents tests d'galit
    4. numrabilit et rattachement des proprits
    5. Fermetures (closures)
  5. Avanc
    1. L'hritage et la chane de prototypes
    2. Mtaprogrammation
    3. Gestion de la mmoire
  6. Rfrences
  7. Objets natifs
    1. AggregateError
    2. Array
    3. ArrayBuffer
    4. AsyncDisposableStack
    5. AsyncFunction
    6. AsyncGenerator
    7. AsyncGeneratorFunction
    8. AsyncIterator
    9. Atomics
    10. BigInt
    11. BigInt64Array
    12. BigUint64Array
    13. Boolean
    14. DataView
    15. Date
    16. decodeURI()
    17. decodeURIComponent()
    18. DisposableStack
    19. encodeURI()
    20. encodeURIComponent()
    21. Error
    22. escape()
    23. eval()
    24. EvalError
    25. FinalizationRegistry
    26. Float16Array
    27. Float32Array
    28. Float64Array
    29. Function
    30. Generator
    31. GeneratorFunction
    32. globalThis
    33. Infinity
    34. Int8Array
    35. Int16Array
    36. Int32Array
    37. InternalError
    38. Intl
    39. isFinite()
    40. isNaN()
    41. Iterator
    42. JSON
    43. Map
    44. Math
    45. NaN
    46. Number
    47. Object
    48. parseFloat()
    49. parseInt()
    50. Promise
    51. Proxy
    52. RangeError
    53. ReferenceError
    54. Reflect
    55. RegExp
    56. Set
    57. SharedArrayBuffer
    58. String
    59. SuppressedError
    60. Symbol
    61. SyntaxError
    62. Temporal
    63. TypedArray
    64. TypeError
    65. Uint8Array
    66. Uint8ClampedArray
    67. Uint16Array
    68. Uint32Array
    69. undefined
    70. unescape()
    71. URIError
    72. WeakMap
    73. WeakRef
    74. WeakSet
  8. Expressions et oprateurs
    1. Addition (+)
    2. Affectation aprs addition (+=)
    3. Assignement (=)
    4. Expression async function
    5. Expression async function*
    6. await
    7. ET binaire (&)
    8. Affectation aprs ET binaire (&=)
    9. NON binaire (~)
    10. OU binaire (|)
    11. Affectation aprs OU binaire (|=)
    12. OU exclusif binaire (^)
    13. Affectation aprs OU exclusif binaire (^=)
    14. class
    15. L'oprateur virgule
    16. L'oprateur conditionnel
    17. Dcrmentation (--)
    18. L'oprateur delete
    19. Affecter par dcomposition
    20. Division (/)
    21. Affectation aprs division (/=)
    22. galit (==)
    23. Exponentiation (**)
    24. Affectation aprs exponentiation (**=)
    25. L'oprateur function
    26. Expression function*
    27. Suprieur strict (>)
    28. Suprieur ou gal (>=)
    29. Oprateur de groupement
    30. import.meta
      1. import.meta.resolve()
    31. import
    32. L'oprateur in
    33. Incrmentation (++)
    34. Ingalit (!=)
    35. instanceof
    36. Dcalage binaire gauche (<<)
    37. Affectation aprs dcalage gauche (<<=)
    38. Infrieur strict (<)
    39. Infrieur ou gal (<=)
    40. ET logique (&&)
    41. Affectation aprs ET logique (&&=)
    42. NON logique (!)
    43. OU logique (||)
    44. Affectation aprs OU logique (||=)
    45. Multiplication (*)
    46. Affectation aprs multiplication (*=)
    47. L'oprateur new
    48. new.target
    49. null
    50. Affectation aprs coalescence des nuls (??=)
    51. Oprateur de coalescence des nuls (Nullish coalescing operator)
    52. Initialisateur d'objet
    53. Prcdence des oprateurs
    54. Chanage optionnel (optional chaining)
    55. Accesseurs de proprits
    56. Reste (%)
    57. Affectation aprs reste (%=)
    58. Dcalage binaire droite (>>)
    59. Affectation aprs dcalage droite (>>=)
    60. Syntaxe de dcomposition
    61. galit stricte (===)
    62. Ingalit stricte (!==)
    63. Soustraction (-)
    64. Affectation aprs soustraction (-=)
    65. super
    66. L'oprateur this
    67. typeof
    68. Ngation unaire (-)
    69. Plus unaire (+)
    70. Dcalage binaire droite non-sign (>>>)
    71. Affectation aprs dcalage droite non sign (>>>=)
    72. L'oprateur void
    73. yield
    74. yield*
  9. Instructions et dclarations
    1. async function
    2. async function*
    3. await using
    4. bloc
    5. break
    6. class
    7. const
    8. continue
    9. debugger
    10. do...while
    11. vide
    12. export
    13. Expression statement
    14. for
    15. for await...of
    16. for...in
    17. for...of
    18. function
    19. function*
    20. ifelse
    21. import
      1. Import attributes
    22. label
    23. let
    24. return
    25. switch
    26. throw
    27. try...catch
    28. using
    29. var
    30. while
    31. with
  10. Fonctions
    1. Fonctions flches
    2. Valeurs par dfaut des arguments
    3. L'oprateur get
    4. Dfinir une mthode
    5. Paramtres du reste (Rest parameters)
    6. L'oprateur set
    7. arguments
      1. arguments[@@iterator]()
      2. callee
      3. length
  11. Classes
    1. constructor
    2. extends
    3. Proprits prives
    4. Champs de classe publics
    5. static
    6. Static initialization blocks
  12. Expressions rationnelles
    1. Backreference: \1, \2
    2. Capturing group: (...)
    3. Character class escape: \d, \D, \w, \W, \s, \S
    4. Character class: [...], [^...]
    5. Character escape: \n, \u{...}
    6. Disjunction: |
    7. Input boundary assertion: ^, $
    8. Literal character: a, b
    9. Lookahead assertion: (?=...), (?!...)
    10. Lookbehind assertion: (?<=...), (?<!...)
    11. Modifier: (?ims-ims:...)
    12. Named backreference: \k<name>
    13. Named capturing group: (?<name>...)
    14. Non-capturing group: (?:...)
    15. Quantifier: *, +, ?, {n}, {n,}, {n,m}
    16. chappement des proprits Unicode
    17. Wildcard: .
    18. Word boundary assertion: \b, \B
  13. Erreurs
    1. AggregateError: No Promise in Promise.any was resolved
    2. Error: Permission denied to access property "x"
    3. InternalError: too much recursion
    4. RangeError: argument is not a valid code point
    5. RangeError: BigInt division by zero
    6. RangeError: BigInt negative exponent
    7. RangeError: form must be one of 'NFC', 'NFD', 'NFKC', or 'NFKD'
    8. RangeError: invalid array length
    9. RangeError: invalid date
    10. RangeError: precision is out of range
    11. RangeError: radix must be an integer
    12. RangeError: repeat count must be less than infinity
    13. RangeError: repeat count must be non-negative
    14. RangeError: x can't be converted to BigInt because it isn't an integer
    15. ReferenceError: "x" is not defined
    16. ReferenceError: assignment to undeclared variable "x"
    17. ReferenceError: can't access lexical declaration 'X' before initialization
    18. ReferenceError: must call super constructor before using 'this' in derived class constructor
    19. ReferenceError: super() called twice in derived class constructor
    20. SyntaxError: 'arguments'/'eval' can't be defined or assigned to in strict mode code
    21. SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated
    22. SyntaxError: "use strict" not allowed in function with "x" parameter
    23. SyntaxError: "x" is a reserved identifier
    24. SyntaxError: \ at end of pattern
    25. SyntaxError: a declaration in the head of a for-of loop can't have an initializer
    26. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated
    27. SyntaxError: arguments is not valid in fields
    28. SyntaxError: await is only valid in async functions, async generators and modules
    29. SyntaxError: await/yield expression can't be used in parameter
    30. SyntaxError: cannot use ?? unparenthesized within || and && expressions
    31. SyntaxError: character class escape cannot be used in class range in regular expression
    32. SyntaxError: continue must be inside loop
    33. SyntaxError: duplicate capture group name in regular expression
    34. SyntaxError: duplicate formal argument x
    35. SyntaxError: for-in loop head declarations may not have initializers
    36. SyntaxError: function statement requires a name
    37. SyntaxError: functions cannot be labelled
    38. SyntaxError: getter and setter for private name #x should either be both static or non-static
    39. SyntaxError: getter functions must have no arguments
    40. SyntaxError: identifier starts immediately after numeric literal
    41. SyntaxError: illegal character
    42. SyntaxError: import declarations may only appear at top level of a module
    43. SyntaxError: incomplete quantifier in regular expression
    44. ReferenceError: invalid assignment left-hand side
    45. SyntaxError: invalid BigInt syntax
    46. SyntaxError: invalid capture group name in regular expression
    47. SyntaxError: invalid character in class in regular expression
    48. SyntaxError: invalid class set operation in regular expression
    49. SyntaxError: invalid decimal escape in regular expression
    50. SyntaxError: invalid identity escape in regular expression
    51. SyntaxError: invalid named capture reference in regular expression
    52. SyntaxError: invalid property name in regular expression
    53. SyntaxError: invalid range in character class
    54. SyntaxError: invalid regexp group
    55. SyntaxError: invalid regular expression flag "x"
    56. SyntaxError: invalid unicode escape in regular expression
    57. SyntaxError: JSON.parse: bad parsing
    58. SyntaxError: label not found
    59. SyntaxError: missing : after property id
    60. SyntaxError: missing ) after argument list
    61. SyntaxError: missing ) after condition
    62. SyntaxError: missing ] after element list
    63. SyntaxError: missing } after function body
    64. SyntaxError: missing } after property list
    65. SyntaxError: missing = in const declaration
    66. SyntaxError: missing formal parameter
    67. SyntaxError: missing name after . operator
    68. SyntaxError: missing variable name
    69. SyntaxError: negated character class with strings in regular expression
    70. SyntaxError: new keyword cannot be used with an optional chain
    71. SyntaxError: nothing to repeat
    72. SyntaxError: numbers out of order in {} quantifier.
    73. SyntaxError: octal escape sequences can't be used in untagged template literals or in strict mode code
    74. SyntaxError: parameter after rest parameter
    75. SyntaxError: private fields can't be deleted
    76. SyntaxError: property name __proto__ appears more than once in object literal
    77. SyntaxError: raw bracket is not allowed in regular expression with unicode flag
    78. SyntaxError: redeclaration of formal parameter "x"
    79. SyntaxError: reference to undeclared private field or method #x
    80. SyntaxError: rest parameter may not have a default
    81. SyntaxError: return not in function
    82. SyntaxError: setter functions must have one argument
    83. SyntaxError: unterminated string literal
    84. SyntaxError: super() is only valid in derived class constructors
    85. SyntaxError: tagged template cannot be used with optional chain
    86. SyntaxError: Unexpected '#' used outside of class body
    87. SyntaxError: Unexpected token
    88. SyntaxError: unlabeled break must be inside loop or switch
    89. SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**'
    90. SyntaxError: use of super property/member accesses only valid within methods or eval code within methods
    91. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
    92. ReferenceError: deprecated caller or arguments usage
    93. TypeError: 'x' is not iterable
    94. TypeError: "x" is (not) "y"
    95. TypeError: "x" is not a constructor
    96. TypeError: "x" is not a function
    97. TypeError: "x" is not a non-null object
    98. TypeError: "x" is read-only
    99. TypeError: already executing generator
    100. TypeError: BigInt value can't be serialized in JSON
    101. TypeError: calling a builtin X constructor without new is forbidden
    102. TypeError: can't access/set private field or method: object is not the right class
    103. TypeError: can't assign to property "x" on "y": not an object
    104. TypeError: can't convert BigInt to number
    105. TypeError: can't convert x to BigInt
    106. TypeError: can't define property "x": "obj" is not extensible
    107. TypeError: can't delete non-configurable array element
    108. TypeError: can't redefine non-configurable property "x"
    109. TypeError: can't set prototype of this object
    110. TypeError: can't set prototype: it would cause a prototype chain cycle
    111. TypeError: invalid 'in' operand "x"
    112. TypeError: class constructors must be invoked with 'new'
    113. TypeError: cyclic object value
    114. TypeError: derived class constructor returned invalid value x
    115. TypeError: getting private setter-only property
    116. TypeError: Initializing an object twice is an error with private fields/methods
    117. TypeError: invalid 'instanceof' operand 'x'
    118. TypeError: invalid Array.prototype.sort argument
    119. TypeError: invalid assignment to const "x"
    120. TypeError: Iterator/AsyncIterator constructor can't be used directly
    121. TypeError: matchAll/replaceAll must be called with a global RegExp
    122. TypeError: More arguments needed
    123. TypeError: "x" has no properties
    124. TypeError: property "x" is non-configurable and can't be deleted
    125. TypeError: Reduce of empty array with no initial value
    126. TypeError: setting a property that has only a getter
    127. TypeError: WeakSet key/WeakMap value 'x' must be an object or an unregistered symbol
    128. TypeError: X.prototype.y called on incompatible type
    129. URIError: malformed URI sequence
    130. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
    131. Warning: unreachable code after return statement
  14. Divers
    1. Aperu des technologies JavaScript
    2. Modle d'excution
    3. Grammaire lexicale
    4. Protocoles d'itration
    5. Mode strict
    6. Gabarits de chanes de caractres
    7. Virgules finales
    8. Fonctionnalits dprcies
MDN

Votre modle pour un internet meilleur.

MDN
Contribuer
Dveloppeureuses
Mozilla

Certaines parties de ce contenu sont protges par le droit d'auteur 19982026 des contributeurs individuels de mozilla.org. Contenu disponible sous une licence Creative Commons.

Web Proxy Viewer  |  New URL  |  Original Page