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fix: capitalize first word in titleCase even if it is an exception word #142

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fix: capitalize first word in titleCase even if it is an exception word #142

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8453778
fix: capitalize first word in titleCase even if it is an exception word
abhi-byte62 Oct 6, 2026
6be606b
fix(titleCase): support space delimiter when splitting string input
abhi-byte62 Oct 8, 2026
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10 changes: 7 additions & 3 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -184,10 +184,14 @@ export function titleCase<
T extends string | readonly string[],
UserCaseOptions extends CaseOptions = CaseOptions,
>(str?: T, opts?: UserCaseOptions) {
return (Array.isArray(str) ? str : splitByCase(str as string))
return (
Array.isArray(str)
? str
: splitByCase(str as string, [...STR_SPLITTERS, " "])
)
.filter(Boolean)
.map((p) =>
titleCaseExceptions.test(p)
.map((p, i) =>
i > 0 && titleCaseExceptions.test(p)
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? p.toLowerCase()
: upperFirst(opts?.normalize ? p.toLowerCase() : p),
)
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12 changes: 12 additions & 0 deletions test/scule.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,18 @@ describe("titleCase", () => {
["foo", "Foo"],
["foo-bar", "Foo Bar"],
["this-IS-aTitle", "This is a Title"],
["in-world", "In World"],
["in world", "In World"],
["inWorld", "In World"],
["and-then", "And Then"],
["and then", "And Then"],
["andThen", "And Then"],
[["in", "world"], "In World"],
[["and", "then"], "And Then"],
["the-quick-brown-fox-and-the-dog", "The Quick Brown Fox and the Dog"],
["the quick brown fox and the dog", "The Quick Brown Fox and the Dog"],
["a-tale-of-two-cities", "A Tale of Two Cities"],
["a tale of two cities", "A Tale of Two Cities"],
])("%s => %s", (input, expected) => {
expect(titleCase(input)).toMatchObject(expected);
});
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