Update

indent/typescriptreact.vim

@@ -0,0 +1,114 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'typescript') == -1
+
+exe 'runtime! indent/typescript.vim'
+" Save the current JavaScript indentexpr.
+let b:tsx_ts_indentexpr = &indentexpr
+
+" Prologue; load in XML indentation.
+if exists('b:did_indent')
+  let s:did_indent=b:did_indent
+  unlet b:did_indent
+endif
+exe 'runtime! indent/xml.vim'
+if exists('s:did_indent')
+  let b:did_indent=s:did_indent
+endif
+
+setlocal indentexpr=GetTsxIndent()
+
+" JS indentkeys
+setlocal indentkeys=0{,0},0),0],0\,,!^F,o,O,e
+" XML indentkeys
+setlocal indentkeys+=*<Return>,<>>,<<>,/
+
+" Multiline end tag regex (line beginning with '>' or '/>')
+let s:endtag = '^\s*\/\?>\s*;\='
+let s:startexp = '[\{\(]\s*$'
+
+" Get all syntax types at the beginning of a given line.
+fu! SynSOL(lnum)
+  return map(synstack(a:lnum, 1), 'synIDattr(v:val, "name")')
+endfu
+
+" Get all syntax types at the end of a given line.
+fu! SynEOL(lnum)
+  let lnum = prevnonblank(a:lnum)
+  let col = strlen(getline(lnum))
+  return map(synstack(lnum, col), 'synIDattr(v:val, "name")')
+endfu
+
+" Check if a syntax attribute is XMLish.
+fu! SynAttrXMLish(synattr)
+  return a:synattr =~ "^xml" || a:synattr =~ "^tsx"
+endfu
+
+" Check if a synstack is XMLish (i.e., has an XMLish last attribute).
+fu! SynXMLish(syns)
+  return SynAttrXMLish(get(a:syns, -1))
+endfu
+
+" Check if a synstack denotes the end of a TSX block.
+fu! SynTSXBlockEnd(syns)
+  return get(a:syns, -1) =~ '\%(ts\|typescript\)Braces' &&
+       \ SynAttrXMLish(get(a:syns, -2))
+endfu
+
+" Determine how many tsxRegions deep a synstack is.
+fu! SynTSXDepth(syns)
+  return len(filter(copy(a:syns), 'v:val ==# "tsxRegion"'))
+endfu
+
+" Check whether `cursyn' continues the same tsxRegion as `prevsyn'.
+fu! SynTSXContinues(cursyn, prevsyn)
+  let curdepth = SynTSXDepth(a:cursyn)
+  let prevdepth = SynTSXDepth(a:prevsyn)
+
+  " In most places, we expect the nesting depths to be the same between any
+  " two consecutive positions within a tsxRegion (e.g., between a parent and
+  " child node, between two TSX attributes, etc.).  The exception is between
+  " sibling nodes, where after a completed element (with depth N), we return
+  " to the parent's nesting (depth N - 1).  This case is easily detected,
+  " since it is the only time when the top syntax element in the synstack is
+  " tsxRegion---specifically, the tsxRegion corresponding to the parent.
+  return prevdepth == curdepth ||
+      \ (prevdepth == curdepth + 1 && get(a:cursyn, -1) ==# 'tsxRegion')
+endfu
+
+" Cleverly mix JS and XML indentation.
+fu! GetTsxIndent()
+  let cursyn  = SynSOL(v:lnum)
+  let prevsyn = SynEOL(v:lnum - 1)
+
+  " Use XML indenting iff:
+  "   - the syntax at the end of the previous line was either TSX or was the
+  "     closing brace of a jsBlock whose parent syntax was TSX; and
+  "   - the current line continues the same tsxRegion as the previous line.
+  if (SynXMLish(prevsyn) || SynTSXBlockEnd(prevsyn)) &&
+        \ SynTSXContinues(cursyn, prevsyn)
+    let ind = XmlIndentGet(v:lnum, 0)
+    let l:line = getline(v:lnum)
+    let l:pline = getline(v:lnum - 1)
+
+    " Align '/>' and '>' with '<' for multiline tags.
+    " Align end of expression ')' or '}'.
+    if l:line =~? s:endtag
+      let ind = ind - shiftwidth()
+    endif
+
+    " Then correct the indentation of any TSX following '/>' or '>'.
+    " Align start of expression '(' or '{'
+    if l:pline =~? s:endtag || l:pline =~? s:startexp
+      let ind = ind + shiftwidth()
+    endif
+  else
+    if len(b:tsx_ts_indentexpr)
+      " Invoke the base TS package's custom indenter
+      let ind = eval(b:tsx_ts_indentexpr)
+    else
+      let ind = cindent(v:lnum)
+    endif
+  endif
+
+  return ind
+endfu
+endif