An error occurred while loading the file. Please try again.
-
Rosanny Sihombing authoredThis reverts merge request !169
5b5df7d0
/** * @fileoverview A rule to control the style of variable initializations. * @author Colin Ihrig */"use strict";//------------------------------------------------------------------------------// Helpers//------------------------------------------------------------------------------/** * Checks whether or not a given node is a for loop. * @param {ASTNode} block A node to check. * @returns {boolean} `true` when the node is a for loop. */function isForLoop(block) { return block.type === "ForInStatement" || block.type === "ForOfStatement" || block.type === "ForStatement";}/** * Checks whether or not a given declarator node has its initializer. * @param {ASTNode} node A declarator node to check. * @returns {boolean} `true` when the node has its initializer. */function isInitialized(node) { const declaration = node.parent; const block = declaration.parent; if (isForLoop(block)) { if (block.type === "ForStatement") { return block.init === declaration; } return block.left === declaration; } return Boolean(node.init);}//------------------------------------------------------------------------------// Rule Definition//------------------------------------------------------------------------------module.exports = { meta: { type: "suggestion", docs: { description: "require or disallow initialization in variable declarations", category: "Variables", recommended: false, url: "https://eslint.org/docs/rules/init-declarations" }, schema: { anyOf: [ { type: "array", items: [ { enum: ["always"] } ], minItems: 0, maxItems: 1 }, { type: "array", items: [
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
{
enum: ["never"]
},
{
type: "object",
properties: {
ignoreForLoopInit: {
type: "boolean"
}
},
additionalProperties: false
}
],
minItems: 0,
maxItems: 2
}
]
},
messages: {
initialized: "Variable '{{idName}}' should be initialized on declaration.",
notInitialized: "Variable '{{idName}}' should not be initialized on declaration."
}
},
create(context) {
const MODE_ALWAYS = "always",
MODE_NEVER = "never";
const mode = context.options[0] || MODE_ALWAYS;
const params = context.options[1] || {};
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"VariableDeclaration:exit"(node) {
const kind = node.kind,
declarations = node.declarations;
for (let i = 0; i < declarations.length; ++i) {
const declaration = declarations[i],
id = declaration.id,
initialized = isInitialized(declaration),
isIgnoredForLoop = params.ignoreForLoopInit && isForLoop(node.parent);
let messageId = "";
if (mode === MODE_ALWAYS && !initialized) {
messageId = "initialized";
} else if (mode === MODE_NEVER && kind !== "const" && initialized && !isIgnoredForLoop) {
messageId = "notInitialized";
}
if (id.type === "Identifier" && messageId) {
context.report({
node: declaration,
messageId,
data: {
idName: id.name
}
});
}
}
}
};
}
};