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prefer-to-have-style.js
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/**
* @fileoverview prefer toHaveStyle over checking element style
* @author Ben Monro
*/
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
const camelCase = (str) => str.replace(/-([a-z])/g, (c) => c[1].toUpperCase());
export const meta = {
docs: {
category: "Best Practices",
url: "prefer-to-have-style",
description: "prefer toHaveStyle over checking element style",
recommended: true,
},
fixable: "code",
};
export const create = (context) => {
function getReplacementObjectProperty(styleName) {
if (styleName.type === "Literal") {
return camelCase(styleName.value);
}
return `[${context.getSourceCode().getText(styleName)}]`;
}
function getReplacementStyleParam(styleName, styleValue) {
return styleName.type === "Literal"
? `{${camelCase(styleName.value)}: ${context
.getSourceCode()
.getText(styleValue)}}`
: `${context.getSourceCode().getText(styleName).slice(0, -1)}: ${
styleValue.type === "TemplateLiteral"
? context.getSourceCode().getText(styleValue).substring(1)
: `${styleValue.value}\``
}`;
}
return {
//expect(el.style.foo).toBe("bar");
[`MemberExpression[property.name=style][parent.computed=false][parent.parent.parent.property.name=/toBe$|to(Strict)?Equal/][parent.parent.parent.parent.arguments.0.type=/(Template)?Literal/][parent.parent.callee.name=expect]`](
node
) {
const styleName = node.parent.property;
const [styleValue] = node.parent.parent.parent.parent.arguments;
const matcher = node.parent.parent.parent.property;
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
return [
fixer.removeRange([node.object.range[1], styleName.range[1]]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceText(
styleValue,
`{${styleName.name}:${context
.getSourceCode()
.getText(styleValue)}}`
),
];
},
});
},
//expect(el.style.foo).not.toBe("bar");
[`MemberExpression[property.name=style][parent.computed=false][parent.parent.parent.property.name=not][parent.parent.parent.parent.property.name=/toBe$|to(Strict)?Equal/][parent.parent.parent.parent.parent.arguments.0.type=/(Template)?Literal$/][parent.parent.callee.name=expect]`](
node
) {
const styleName = node.parent.property;
const styleValue = node.parent.parent.parent.parent.parent.arguments[0];
const matcher = node.parent.parent.parent.parent.property;
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
return [
fixer.removeRange([node.object.range[1], styleName.range[1]]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceText(
styleValue,
`{${styleName.name}:${context
.getSourceCode()
.getText(styleValue)}}`
),
];
},
});
},
// expect(el.style).toContain("foo-bar")
[`MemberExpression[property.name=style][parent.parent.property.name=toContain][parent.parent.parent.arguments.0.type=/(Template)?Literal$/][parent.callee.name=expect]`](
node
) {
const [styleName] = node.parent.parent.parent.arguments;
const matcher = node.parent.parent.property;
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
return [
fixer.removeRange([node.object.range[1], node.property.range[1]]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceText(
styleName,
styleName.type === "Literal"
? `{${camelCase(styleName.value)}: expect.anything()}`
: context.getSourceCode().getText(styleName)
),
];
},
});
},
// expect(el.style).not.toContain("foo-bar")
[`MemberExpression[property.name=style][parent.parent.property.name=not][parent.parent.parent.property.name=toContain][parent.parent.parent.parent.arguments.0.type=/(Template)?Literal$/]`](
node
) {
const [styleName] = node.parent.parent.parent.parent.arguments;
const matcher = node.parent.parent.parent.property;
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
return [
fixer.removeRange([node.object.range[1], node.property.range[1]]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceText(
styleName,
styleName.type === "Literal"
? `{${camelCase(styleName.value)}: expect.anything()}`
: context.getSourceCode().getText(styleName)
),
];
},
});
},
//expect(el).toHaveAttribute("style", "foo: bar");
[`CallExpression[callee.property.name=toHaveAttribute][arguments.0.value=style][arguments.1][callee.object.callee.name=expect]`](
node
) {
context.report({
node: node.arguments[0],
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
return [
fixer.replaceText(node.callee.property, "toHaveStyle"),
fixer.removeRange([
node.arguments[0].range[0],
node.arguments[1].range[0],
]),
];
},
});
},
//expect(el.style["foo-bar"]).toBe("baz")
[`MemberExpression[property.name=style][parent.computed=true][parent.parent.parent.property.name=/toBe$|to(Strict)?Equal/][parent.parent.parent.parent.arguments.0.type=/((Template)?Literal|Identifier)/][parent.parent.callee.name=expect]`](
node
) {
const styleName = node.parent.property;
const [styleValue] = node.parent.parent.parent.parent.arguments;
const matcher = node.parent.parent.parent.property;
const startOfStyleMemberExpression = node.object.range[1];
const endOfStyleMemberExpression =
node.parent.parent.arguments[0].range[1];
let fix = null;
if (
typeof styleValue.value !== "number" &&
!(styleValue.value instanceof RegExp) &&
styleName.type !== "Identifier"
) {
fix = (fixer) => {
return [
fixer.removeRange([
startOfStyleMemberExpression,
endOfStyleMemberExpression,
]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceText(
styleValue,
typeof styleName.value === "number"
? `{${getReplacementObjectProperty(
styleValue
)}: expect.anything()}`
: getReplacementStyleParam(styleName, styleValue)
),
];
};
}
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix,
});
},
//expect(el.style["foo-bar"]).not.toBe("baz")
[`MemberExpression[property.name=style][parent.computed=true][parent.parent.parent.property.name=not][parent.parent.parent.parent.parent.callee.property.name=/toBe$|to(Strict)?Equal/][parent.parent.parent.parent.parent.arguments.0.type=/(Template)?Literal/][parent.parent.callee.name=expect]`](
node
) {
const styleName = node.parent.property;
const [styleValue] = node.parent.parent.parent.parent.parent.arguments;
const matcher = node.parent.parent.parent.parent.property;
const endOfStyleMemberExpression =
node.parent.parent.arguments[0].range[1];
let fix = null;
if (
typeof styleName.value !== "number" &&
styleName.type !== "Identifier"
) {
fix = (fixer) => {
return [
fixer.removeRange([
node.object.range[1],
endOfStyleMemberExpression,
]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceText(
styleValue,
getReplacementStyleParam(styleName, styleValue)
),
];
};
}
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix,
});
},
//expect(foo.style).toHaveProperty("foo", "bar")
[`MemberExpression[property.name=style][parent.parent.property.name=toHaveProperty][parent.callee.name=expect]`](
node
) {
const [styleName, styleValue] = node.parent.parent.parent.arguments;
const matcher = node.parent.parent.property;
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
if (
!styleValue ||
!["Literal", "TemplateLiteral"].includes(styleValue.type)
) {
return null;
}
return [
fixer.removeRange([node.object.range[1], node.property.range[1]]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceTextRange(
[styleName.range[0], styleValue.range[1]],
`{${getReplacementObjectProperty(styleName)}: ${context
.getSourceCode()
.getText(styleValue)}}`
),
];
},
});
},
//expect(foo.style).not.toHaveProperty("foo", "bar")
[`MemberExpression[property.name=style][parent.parent.property.name=not][parent.parent.parent.property.name=toHaveProperty][parent.callee.name=expect]`](
node
) {
const [styleName, styleValue] =
node.parent.parent.parent.parent.arguments;
const matcher = node.parent.parent.parent.property;
context.report({
node: node.property,
message: "Use toHaveStyle instead of asserting on element style",
fix(fixer) {
if (
!styleValue ||
!["Literal", "TemplateLiteral"].includes(styleValue.type)
) {
return null;
}
return [
fixer.removeRange([node.object.range[1], node.property.range[1]]),
fixer.replaceText(matcher, "toHaveStyle"),
fixer.replaceTextRange(
[styleName.range[0], styleValue.range[1]],
`{${getReplacementObjectProperty(styleName)}: ${context
.getSourceCode()
.getText(styleValue)}}`
),
];
},
});
},
};
};